Okay, bought the GM one last night at work, just because they are more readily available than the Denso ones, and cheaper. Part # is 1345-6-7, fits Chevy pickups, 1987-1996, so every parts store has them. Just had to swap the pulley for a v-belt one.

Blown 71, where did you T into the stock field and amp gauge wires? I need to take out the stock regulator and wiring.

Also, hooking the ammeter wire right to the charge post won't fry the wires or the ammeter inside?? I don't think I want 100a going through my dashboard!

Thanks for your help!
Nick,
Will wire it up Friday...