HEI Distributor Tach issues, Issue has been resolved
Some points tachs require a filter when used with HEI. This one works. R7 needs to be changed to 1.8k ohm for HEI. I get an old plastic medicine bottle & put the components inside, with 4 wires exiting. I pump the bottle full of neutral cure silicon [ it is not conductive ]. Bottle is tie wrapped to harness under the dash.
Some points tachs require a filter when used with HEI. This one works. R7 needs to be changed to 1.8k ohm for HEI. I get an old plastic medicine bottle & put the components inside, with 4 wires exiting. I pump the bottle full of neutral cure silicon [ it is not conductive ]. Bottle is tie wrapped to harness under the dash.