I bought a "plug-n-play" tach from FORGMANN for the BEAMS swap, but it's all wrong. When I turn the ignition to ACC, it tells me the car is revving at 3k. When I crank it up and drive, it seems to add rpm's at the right rate... They just start at 3k. So I'm idling around 4k. How do I fix it? I tried searching and searching, but I'm running out of ideas. Thanks guys!
Calibrating tach - 6G Celicas Forums
Sounds like a ground issue. I had a bad ground in my project car a while back. When I turned my lights on, apparently I was revving to 2k. When I hit my brights, it was 4k. I never figured out which ground it was, but I'd check all the engine grounds just in case.
"Employ your time in improving yourself by other men's writings, so that you shall gain easily what others labored hard for." -Socrates. Even Socrates told us touse the search button!2006 Aston Martin V8 Vantage.1998 Celica GT-BEAMSSwapped.2022 4Runner TRD Off Road Prenium.2021 GMC Sierra AT4.
Blast! Where can I find the grounding info? Should I try flipping lights and such to see if it makes a difference?
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QUOTE (richee3 @ Jan 5, 2012 - 7:18 PM) 
>Sounds like a ground issue. I had a bad ground in my project car a while back. When I turned my lights on, apparently I was revving to 2k. When I hit my brights, it was 4k. I never figured out which ground it was, but I'd check all the engine grounds just in case.
I had this issue with my stock tach after removing the needle (lesson learned). That little peg the needle rests on is there for a reason lol. My fix was pulling the needle, turning the key to ACC, then putting the needle back on at the zero position. I doubt this is your issue tho...