I hate to sell out the 720 crowd like this, but since I'm in the Z crowd too now, I guess I have to. The 720 trucks (my '84 at least) already come with an FP relay exactly like you guys are wanting. It won't turn on without an alternator signal. They should be in good shape, because every one I've ever seen got bypassed when somebody replaced the FP and didn't realize how the relay worked. They assumed it was bad when it didn't start up at RUN, and ran a wire direct to the IGN fuse. They may be in a lot of other early eighties carbed Nissans, but I've never looked into it, plus the cars were mostly FI by then. . . Scott B Gainesville, FL '74 260Z, F54/p90a, flat tops, 6-1, 2.5, Flowmaster 40, 307 Blue(soon) '84 720 KingCab 4x4 - Next resto project