posted August 07, 2004 03:29 AM
I have new auto meter tach and it works ok then starts to jump really eractic like from two to seven and back , rewired it and it done the same. Put it in my 91 silverado and it works great. My racer has accel coil, msd module and the timming locked. My truck has stock hei so what could make it do this?
posted August 07, 2004 01:43 PM
The MSD module is the culprit. You need a shunt filter on the green tach wire. That should make it stop doing that.