This is off base. But anyone can help me on tach wiring issues I have on my 7.3 into 47 Chevy 6400? I have 4 terminals on back of tach. Ign,God, 8cyl,Sgt. Got a clue?i understand for gas but not diesel. I have rebuilt factory Chevy gauges to house the two gauges that is necessary for computer to operate vas and engine. Thanks

29 Ford
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31 Ford
55 panel
95 4 door power stroke
49 chevy 2 ton
47 2 ton grain bed w/ hoist.
Many trucks waiting