> My company makes a part which attaches to the alternator output, designed > to simulate a tachometer signal for remote starters. I doubt it's useful to the > OP though. (This part tends to only be used on large diesel engines) >=20 > http://www.directedstore.com/manuals/454T.pdf That is the way, older Volkswagen (and other brands) Diesel engines generated a tacho signal of the engine, before the =B5controller based injection systems made this job. You just have to calculate the relation between crank rpm and alternator rp= m und you have your crank rpm. Best Jens --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .