[aumoore]

Chuck
I forgot to ask you on the phone the other night. Are the gauges grounded properly? I am running SW from Finish Line and no problems. Also make sure you do not use too much teflon tape on the sending units as they have to ground to the engine. Teflon tape can isolate the sending unit making it useless.

Also use a ohm meter to test continuity on you wiring harness.

I think the MSD needs a adapter module to work with certain tachometers. If I remember SW is one of them. I think my Mallory ignition box had dip switches for different types of tachometers.