Hi Dennis,
It was very easy. On the back of the stock tack you have 3 wires, black (ground), brown (power) and grey (ignition). The Autometer also has 3 wires, black (ground), red (power), green (ignition). I shrink wrapped about 18 inches of the wiring and added an inline 4amp fuse. Then I soldered on small rings to the wires, put the wires over the studs on the tack (after cleaning them with contact cleaner) and closed it up. The Autometer can be set for our ignition (false fire). Amazingly enough it worked right away. BTW I got the small rings for the wires and the inline fuse at Radio Shack since the ones at the auto parts store were too big.
Doug