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Old 07-09-2007, 09:58 PM   #1
Patrick Olsen
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Default 7k RPM tachometer to 8k RPM tachometer swap - any idea what's involved?

My '97 2.5GT has a 7k RPM tachometer with a 6500rpm redline. In the not too distant future I intend to have the ECU reclocked to raise the rev limiter to 7150rpm, so it would be nice to have a tachometer that actually reads that high. I will also eventually be putting an EZ30R in the car, which has (AFAIK) a 7000rpm redline.

On Ebay right now there's a JDM instrument cluster from a BG5 Legacy. It's got the speedo in km/h, which I obviously don't need, but it also has an 8k RPM tachometer with a 7k redline, which would be pretty nice to have.

Anyone know if the tachometers are compatible with each other? My hunch is that the 8k RPM tach would work just fine, but I don't really know how the tach is driven, so I could be wrong. I'd appreciate any info from people who have put JDM instruments into their cars.

Thanks!
Pat Olsen
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Old 07-10-2007, 05:38 AM   #2
STi_v4_Wagon
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I am pretty sure if you can find a tach that fits in your cluster it will work. I have an impreza 9k rpm tach from a ver2 sti for sale if you're interested. 7k redline.
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Old 07-10-2007, 09:10 AM   #3
Patrick Olsen
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Without knowing what will fit, it's kinda hard to say if I'm interested. If I buy the BG cluster I can be reasonably confident it's the same as my BD cluster, since it's the same car.

Pat
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Old 07-10-2007, 10:54 AM   #4
mbritton
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Have a nice deal. thanks.
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Old 07-16-2007, 09:46 AM   #5
Patrick Olsen
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Well, I went ahead and bought the thing on Ebay, so we'll see how it works out.
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Old 07-16-2007, 10:09 AM   #6
NMLegacy
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I do not know about BD/BGs, but on a BE it is plug and play. And the tach displayed correct RPMs.
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Old 07-16-2007, 10:17 PM   #7
Patrick Olsen
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Well that's good to hear.
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Old 08-04-2007, 12:49 AM   #8
Patrick Olsen
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Wed and Thurs I got around to attempting the swap. Long story short: no go, at least for now. The instrument clusters appear to be identical, with the same 3 big plugs and 1 little blue plug on the back. However, the printed flexible plastic circuit board thing that makes up the back of the cluster must be slightly different - more on that in a bit.

I had pulled the JDM 8k tach out of its cluster a few days back. Wednesday evening I pulled the USDM cluster out and removed the stock tach. The first thing I noticed as soon as I picked up the 8k tach is that the gauges were a slightly different shade. My stock ones are pretty much black, while the JDM ones are a dark grey. Not a huge difference, but you can see it here (USDM speedo in JDM gauge cluster):



The next thing I quickly figured out is that the 2 tachs are not the same. The face is the same shape, so no worries there, but the brains on the back are completely different, so the 8k tach wouldn't mount up to the USDM cluster - the 3 screws that hold it in are in different locations.

(USDM 7k tach on the left, JDM 8k tach on the right)

So, at that point I figured I'd put my MPH speedo into the JDM cluster so I could use the 8k tach. Swapped the speedo over (no issues there) and installed the cluster in the car. As I said before, the 3 big plugs (along the upper edge of the cluster) and the little blue plug (to the speedo) are all the same, so it hooked in just fine. When I hooked the battery up, though, I had some weird indications. On the little "door ajar" diagram, the driver's door was always open. Opening and shutting the driver's door triggered the high beams indication. Hmmm... And, the final nail in the coffin, when I started the car the tach sat on 0 and didn't move.

So, the harnesses plugged into the cluster just fine, but clearly the circuits don't all follow the same path. I took a couple of pictures of the back of each cluster so I can compare them without having to pull the cluster out again, then put the MPH speedo back into the USDM cluster and reinstalled that. Whenever I get a chance to look at things I'll update what I find.

Pat
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Old 08-04-2007, 10:05 AM   #9
Jaxx
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sorry, but i lol'd about the door ajar and high beam indicators ..
constructive part of post
it is the same story about the rs 00/01 and ver 5 cluster it plugs in but is pinned very differently the v6 on the other hand plugs right in .. so you might need to try different year bg clusters if possible?
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