[79 Silverado/454]

Originally Posted by gmachinz

The white wire does go out to the tach BUT-on HEI trucks, that white wire goes out through the firewall grommet to one side of the tach filter, the other side of the filter is brown and goes to the HEI TACH terminal on the distributor. The white wire should also have a single female Packard 56 connector which snaps into the male connector from the tach filter. If you need a NEW tach harness w/filter PM me-I build reproduction tach harnesses which unlike all other aftermarket offerings, I include the tach filter with mine as well.

Thanks Hatzie for telling me where the wires go. That's a big help. gmachinz PM sent.