Re: Low RPM or Speed Tachometer for Tuning
You're looking for highest vacuum reading. I can't tell you what that number may be, there's innumerable variables, but if 15 is peak leave it there. Both screws should be the same turns out. Give us some info about your combo if you want tuning tips. As in- what year, make, model, engine, ignition, carb, trans, rear end, cam, compression, intake, exhaust, modifications, intended use. The more you tell us the more we can help.
69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt
76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt