HEI Distributor Tach issues, Issue has been resolved
There are two types of tach designs used by OEMs. One design connects to the coil + terminal [ mainly on Fords I believe ]. The far more common design connects to the coil - ve terminal.
The filter cct below worked with my GM OEM tach. Should work on Mopar tachs. If using a GM HEI module, change R7 to 1.8kohm.
There are two types of tach designs used by OEMs. One design connects to the coil + terminal [ mainly on Fords I believe ]. The far more common design connects to the coil - ve terminal.
The filter cct below worked with my GM OEM tach. Should work on Mopar tachs. If using a GM HEI module, change R7 to 1.8kohm.
