auxilary Posted July 11, 2002 Share Posted July 11, 2002 the stock tach until 73 has 4 prongs, 73 has 3. as everyone knows, 73 tachs go out all the time. unfortunately, i have that problem. I have a spare 4 prong tach, so my question is can one wire up the 4 prong to 3? What are the wiring differences? It's impossible to find a 73 tach at a junkyard Quote Link to comment Share on other sites More sharing options...
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