Tacho wiring

Dana67Dart said
How many wires does your analog tach have?

Older style tachs got their signal from the negative side of the coil. (Point and OEM Chrysler electronic ignition) Not sure what modern techs use.

Iirc the msd adapter was to eliminate the "multiple" spark the MSD produced and give the tach a single signal to fire.

yes it's a single dark green wire to the tacho from the negative side of the coil. It is electronic ignition using a Bosch BIM024 ignition module instad of the factory box, ballast resister etc. I'm using Msd 8534