Ok, so I've been thinking about setting up the nitrous timing retard the Rob made available to us using the turbonator cal, instead of adjusting timing on the distributor. I'm trying to figure out how to trigger the timing retard, and looking at the available switches it looks like using the A/C switch is my best option.

Unfortunately there isn't anything left behind the dash to actually turn on the A/C, so I was thinking if I just tap a wire into the my "nitrous arm" switch and run that wire to the A/C relay so when the nitrous is armed, the relay clicks on. Is that all that is needed to make the computer think the A/C is on, and therefore pull the timing?

As far the the tune goes, is the timing retard in the cal the same as if I were to change base timing on the distributor or is there some sort of calculation the computer uses. For example, a 2 degree setting in the tune actually equals 4 degrees being pulled on the engine.

Also, the dummy question of the day. Which relay is the A/C relay?