I had my tach rebuilt last year at the tach shop . When I start up my car the tach jumps up to 5000-6000 rpm. After car is running it will setle down and show the proper rpms. can any one help me wth this problem.
I completly rebuilt the car. I installed a promaster mallord coil .The company who rebuilt tach wants me to ship it back to them but I don't think it has any thing to do with tach. I realy don't want to pull out the tach. Once car is runnig tach works .
Don't hold your foot on the gas when you start it! Just kidding' I have seen gauges that cycle up and down with the switch being turned on. I figured it was a test of sorts. Maybe they added that function?
Hi, just happened to be looking at the wiring diagrams, stock the cars had a 1.4 ohm resistor wire or I here that some had a Ballast resistor. There is also a wire coming directly from the starter relay for a hot spark during startup and this may be were spike is coming from. but I must say I have never noticed my tach jumping as you describe, just never paid it any mind, will be looking now though.
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