Sorry to address this tach issue again - I have a tach that usually reads 1000 RPM no matter what the engine speed. It will vary sometimes, especially if I let off the accelerator.
I found the unit on the fender that has the amplifier. But, I don't think my car has the circuit board people have spoken of. I unscrew the cap and the part that is still attached to the fender has a number of female electrical contacts. Under the cap is nothing at all. Where is this amplifier unit? Could my tach work at all without it? I am confused...
Thanks