So I'm taking Dons' advice and running a lead from the STA on the alternator to my choke to see if that will fix my tach (I had been using a lead from the "+" on the coil). When I disconnected the big wire saying "BAT" on the alternator it accidentally hit the body and sparked just like if you hit the battery positive lead to ground. I would think the key would need to be on for that to happen. The car has always seemed to run fine and charge properly. Is that normal? Thanks.