We have an aftermarket electronic tachometer on our 1996 VW 2.0. Simple enough, it just connects to the coil lead. It works fine at low speed, under about 3k rpm. Once we get to the yehaw rpms, the tach dies. The connection seems fine and I can't think of any explanation why we are losing signal at high rpm, other than that it just becomes too noisy. I see tach signal filters can be bought online, but it seems that these are just a nicely packaged capacitor(s) and resistor(s). I have lots of those kicking around... looking for some insight on how to wire and what values I might want to try to clean up the signal.
