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Old 01-12-2003, 01:46 PM   #1
mhbrown
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Default Anyone ever figure how to dim Omori gauges?

I have searched the archives and there are several posts over the last year about designing a work around to dim Omori gauges with the dash lights. No one seems to have actually done it, though.

I don't have the electrical knowledge to design something like this -- but I can implement something that someone else designed.

So, if you did this and can post instructions, part numbers, etc., I would appreciate it.
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Old 01-12-2003, 05:22 PM   #2
WRX Potential
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BUMP
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Old 01-12-2003, 07:15 PM   #3
Kean
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I would imagine tapping into the lighting circuit for the stock gauges would be adequate but not recommended if you are unsure of what you're doing. I too have Omori gauges. I was planning to explore this when my last gauge arrives. Currently, I just have them tapped into the clock wiring. I'll let you know if I find out any info on this.
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Old 01-12-2003, 09:31 PM   #4
mhbrown
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Nope. The Omori electric gauges have 12v+ for the gauge, ground and a white wire to hook into the lighting circuit. What you get is gauges that light up when you turn the headlights on; but they will not dim.

Subaru uses an unusual method of dimming. One wire provides 12v all the time; as I understand it, the other provides 0v to -12v based on the dimmer position.

In order to get the gauges to dim, you have to capture the current provided by the 2 wires and convert it into something the 1 wire (white) on the gauges can understand.

OK, I understand what one has to do. Now, who has done it?
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Old 01-13-2003, 11:34 AM   #5
Kean
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Quote:
Originally posted by mhbrown
Nope. The Omori electric gauges have 12v+ for the gauge, ground and a white wire to hook into the lighting circuit. What you get is gauges that light up when you turn the headlights on; but they will not dim.

Subaru uses an unusual method of dimming. One wire provides 12v all the time; as I understand it, the other provides 0v to -12v based on the dimmer position.

In order to get the gauges to dim, you have to capture the current provided by the 2 wires and convert it into something the 1 wire (white) on the gauges can understand.

OK, I understand what one has to do. Now, who has done it?
Thanks. I wasn't aware of that. At least I won't waste my time. I'll keep an eye out and let you know if I find any info on a set up for this.

Kean
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Old 01-13-2003, 04:20 PM   #6
kenchan
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i dont usually fiddle around with the dimmer
pot so my solution would be to get a different
pot and either set it and hide it behind the
dash or have access to it under the dash or
something.

how often do you guys change the dimmer
settings? i even took out my
dimmer dial on my other car when i had to
install a foglamp switch to take its place.
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Old 01-20-2003, 09:10 AM   #7
mhbrown
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Quote:
Originally posted by kenchan
so my solution would be to get a different
pot and either set it and hide it behind the
dash
So, anyone have any idea what I would buy to do this?
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Old 01-20-2003, 12:58 PM   #8
satrya
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Question what's different about omori gauge lighting?

Do the omori gauges use incandescent bulbs, or do they use LED (or other types)? My autometer uses a 12V incandescent bulb, iirc. I tap ground and dimmed power supply off the stereo unit. The wiring instructions were based on scoobymods' info. It gets dimmer when I dim the speedo/tach cluster. Wouldn't this work for omori gauges as well? Curious.
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Old 02-21-2003, 02:45 PM   #9
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i'm confused by why you would want to do this...

what could possibly be gained by having the guages dimmer?

my guages are too dim and i wish they would be brighter as it is (stock) i wish i had your problem of guages that are apparently too dark

the dimmer on my car is mroe of an annoyance, my coatsleve or somethign will drag across the headlight arm and turn the dimmer to dark so i cant see them all because i had to turn on the rear defog

however
if you would want to do this
from my understanding of this thread, you'd want to wire the stock dimmer's variable resistor (of whatever kind that they use) to the ground wire.

that's how you make DC fans slow down you wire a potentiometer in line with the ground and the hot to the +. and you turn the pot and the fan slows down because the current is reduced.

and if subarus are wired witht he ground variablility of the guages then the wire comign from the stock dimmer dial is already a ground wire, and you just need to hook the omari's ground to the car's dimmer somehow but figure out a way to not affect the actual measuring ablities of the guage.
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Old 02-21-2003, 05:01 PM   #10
satrya
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Quote:
Originally posted by nomadtw
what could possibly be gained by having the guages dimmer?
Being able to adjust the brightness of the gauges and other in-cabin display is useful when you're traveling long distances at night, in low light level areas. Doing so improves your eye's sensitivity to objects outside of the car. I don't think it's that useful otherwise.

my 2 cents
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Old 02-21-2003, 06:49 PM   #11
Kean
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Quote:
Originally posted by satrya
Being able to adjust the brightness of the gauges and other in-cabin display is useful when you're traveling long distances at night, in low light level areas. Doing so improves your eye's sensitivity to objects outside of the car. I don't think it's that useful otherwise.

my 2 cents
.....2 cents well spent. (I agree)
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Old 02-21-2003, 07:05 PM   #12
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for the gauges.... do they have 2 wires exclusive for the light or do they share a common ground (negative) for the light and the electrical components? Remember that subaru (unlike the standard) uses the dimmer on the negative side of the current and not the positive. That is why the dimmer does not seem to work sometimes.
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Old 02-21-2003, 07:08 PM   #13
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on my autometer lunar A/F gauges it came with a common negative wire, I had to open the gauge and split the negative at the point where it was merged at the pcb board inside. Once I got 2 negatives runing out of the gauge (1 for the light and 1 for the actual power to the unit) then it was pretty easy to hook them up.
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Old 02-21-2003, 07:42 PM   #14
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Quote:
Originally posted by zacek
on my autometer lunar A/F gauges it came with a common negative wire, I had to open the gauge and split the negative at the point where it was merged at the pcb board inside. Once I got 2 negatives runing out of the gauge (1 for the light and 1 for the actual power to the unit) then it was pretty easy to hook them up.
good thinking, now to tear apart my new $250 gauge
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Old 02-21-2003, 08:47 PM   #15
WRX Potential
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isht, if someone figures out a good way to install a separate dimmer switch for the aux. gauges alone i'd be happy to do that, maybe use one of those empty slots for a (quality, preferably oem) pot switch, or maybe in a worst-case scenario, add a dinky little radio shack switch, adjust accordingly and then have it hidden away somewhere beneath the pod? just some other ideas to throw out there b/c i know that i've looked into this situation before and i don't think that it is possible to hook up the gauges to dim w/ the stock dimmer system, although it would be nice to have the option.
B
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Old 07-11-2013, 01:37 PM   #16
jhayesvw
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Sorry to bump an old thread but yes, they figured it out.
To me its alot of mess to dim the gauge.
I picked up an Omori gauge last year but havent put it in because I was told
its very bright.
I looked into this dimmer solution and decided it was a PITA.

I cant decide if I should just sell the gauge and keep the stock gauge, deal with it being very bright, or do the whole dimmer setup.

http://www.scoobymods.com/showthread...oem-3115.html?
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Old 07-12-2013, 10:32 AM   #17
car_freak85
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The dimmer circuit is very simple, especially if you have any experience with electronics or soldering. I don't, and it was still pretty straight forward.

Now my three '02-03 Omori gauges dim perfectly! The OEM dash gauges are a bit brighter, but at night they look good.

I would say give it a try, the parts were about $5 total and I used a soldering iron at work, messed up the first one, bought more parts and just handed them to our wiring guy with the instructions, poof, done.

I could have done it on the second try, but his work was much cleaner.
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Old 07-12-2013, 10:38 AM   #18
Jack
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The Subimods circuit is very simple. I was going to suggest to design a circuit to differentially sense the voltage to one of the stock panel lights and then PWM the light (white wire) into the gauge. Although that's way more complicated for this application, it would work universally.

(expecting UKScooby to approve of my solution )
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