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#3 (permalink)

09-15-2003, 07:54 PM

TonyMadrid TonyMadrid is offline

CC Member

Join Date: Apr 2003

Location: Sparrowbush, NY

Cobra Make, Engine: A&C 351W, C4

Posts: 407

Not Ranked

Gauges

Just had a problem with a SW Tach today. I'm running an MSD ignition system and when I read their manual it said that SW (voltage triggered) tachs require an adaptor. I called MSD techs and the guy I got said to wire the tach according to SW instructions.

Well their instructions call for grounding the neg terminal, run the positive to a switched ignition hot, and run the signal terminal to the negative side of the coil. Tried it and it didn't work. Called SW and their tech said that their tachs are compatible with MSD but instead of going to the neg terminal of the coil, send the signal terminal of the tach directly to the tach output on the side of the MSD ignition control box. Tried it and it works fine.

ENTDOC is correct about the grounding. Got to make sure that all of your gauges are properly grounded.

Good Luck

Tony

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