super, on yours the 12 volt terminal would go to a terminal on your fuse box labeled ACC. This will turn on the power whenever your ignition is on. The one labeled coil, would go to the negitive side of the coil if you still have the points, or to the TACH spade terminal on an HEI set up...right beside the 12 volt wire that powers the distributor. Your third unlabeled terminal is posably for mounting on the original inst panel...but can certianly be used to ground the unit. If you look, you'll see it is not insulated from the backing plate like the other 2 posts are.
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