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You would hook to the negative side of the coil. Some HEI distributor caps are marked "tach".
Since the coil is in the distributor, simply hook the tach 'trigger' wire to the out put on the side of the distributor cap marked 'tach'.
The tach should connect to the distributor.
if it is a hei ignition there is a place on the distributor cap that says tach.
On the dist., cap, where the wires go in, there is a tab labeled TACH.
u have to look at ur distributor if it is an HEI "coil on top there is markings on the distributor cap for the tach but if it is a regular distributor with an external coil you hook it up to the neg wire off the coil neg/ black wire
The green wire from the tach goes to the negative side of the coil.
it's located at the bottom of the distributor
one white wire goes to the distributor, the other goes nowhere. This is the lead that goes to the tach
how do you hook up a sunpro super tach 2
green
Should have four wires: Positive, Ground, Light, and Tach. Put ground first! I made this mistake and took out all the lights in my dash. Hook the tach wire up to the male end on the distributor cap (you'll have to route it through the firewall). Hook the positive up to a nearby wire or open spot in your fuse box. I tapped off the radio. Hook the light into your panel instrument light circuit.