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Old 01-19-2005, 01:34 PM   #1
Scooby Specialist
Member#: 6459
Join Date: May 2001
Chapter/Region: SCIC
Location: Orange County, SoCal.
2008 LGT Spec-B stg4
Delicious Tuned 336/336

Default I'm not an electrician...Help with gauge wiring question!

I understand how to install my gauges and just where/how to tap for illumination but,

Each Autometer gauge requires +12 switched & GND (one gauge-I forget which-says +12 ignition switch, is that the same?).

If I wire them all together (eg. +12 from each gauge twisted/soldered together first then tapped) will this be too much stress on the wire I tapped into? The clock also shares duty with the interior lights so I was thinking that I am ok as long as I don't turn on everything at once.

I was going to tap into the +12 and switched +12 that the clock uses but it's rated at 15A and uses a smaller gauge wire.

Or I could tap into the radio (uses 20A and slightly larger gauge wire).

Should I split the duty up eg. one gauge to clock and other two to the radio or does it really make a difference?

Also, I understand if I run a wire tothe battery I should install a fuse. Is it overkill doing so to a wire you tap off of that is already fused?


I'll post pics of my gauges when done.

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Old 01-19-2005, 01:58 PM   #2
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Member#: 29355
Join Date: Nov 2002
Chapter/Region: NWIC
Location: seattle

i would also like to know the answers to some of these questions...

pretty much you should be able to power them all off the same wire but they might not get as much wattage out of it as if you drew off of seperate wires.

using a fuse when off the battery isn't just a 'good idea', it's almost essential...

from Basic Car Audio Electronics .com -
Function: A fuse is generally inserted into an electrical circuit for 1 of 2 reasons, either to protect the power source which includes the wire that connects the power supply to the electrical device, or to protect the electronic equipment. The electronic equipment manufacturers specify a fuse rated to open the electrical circuit before damage can be done to the device or open the circuit if the electronic device fails in some way (electronic devices may pull excessive current when they fail). If a fuse larger than the specified fuse is used, a small mistake when installing the equipment may cause catastrophic failure of the equipment. WHEN, not if, WHEN you're thinking of replacing a blown fuse with a higher rated fuse ask yourself if you know more than the engineer who designed the equipment. Don't get in a hurry when installing electronic equipment. Take the time to go get the right fuse. 50 cents for a fuse is better than $50 labor plus the cost of the replacement parts for a repair job.
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Old 01-19-2005, 02:03 PM   #3
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Location: Tucson
04 CTS-V b/b/b
99 GMC Highrider


You can do them all off of one wire going to the clock if you want. The clock wire ran my Defi controller, display, and BF boost gauge just fine. My friend has the Defi heads up display, regular display, controller, and 2 other gauges powered off the clock wire.
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Old 01-19-2005, 02:05 PM   #4
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Location: Seattle, WA
2009 Audi A3 2.0T q
Lava Grey


correct - your gauages are drawing MAYBE 200mW each. Your fine tying them all off 1 wire.
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Old 01-19-2005, 04:30 PM   #5
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Location: Orange County, SoCal.
2008 LGT Spec-B stg4
Delicious Tuned 336/336


Thanks !!

Can't wait to finish what I started!

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Old 01-19-2005, 06:38 PM   #6
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Location: portland, OR
04 WRX


i installed my gauges last night and used the clock wiring for power and ground
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