Harness will be ready to go tonight - need to pick up some fuse holders and alligator clips.

We'll need 2 3/8" studs to hook the gnd. ring termnals (qty.2) up.

So final wire count:

gnd. ring terminals - 2
battery connection - 1
tach connection (fuel only) - 1
ignition switch hot in run & crank - 2 (1 needed, wide band O2 - 1)
O2 sensor connector - 1
Coolant sensor - 1 plug

If using the Calif. '81 spark control dist. to control spark its almost plugn and play.

The tach, ign. sw and battery/gnd connections are really the only splices into the vehicle electrical system for fuel only control.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them