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  • Tach Signal

    Can anyone confirm for me that the DIS used in 2.8/3.1 MPFI applications puts out a 5 volt square wave signal on the tach wire?

    Thanks!

    -- Scott

  • #2
    RE: Tach Signal

    square wave? Well I'll scope it..but im sure it is. Why?
    88 Beretta GTU turbo . 90 Black ASC/McLaren TGP, awaiting 4t80. 2003 Grand AM se 3400/4t45 daily grind.

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    • #3
      I'm modifying my stock tach with a circuit board developed by the Sunbeam Tiger guys for our old current driven British car tachometers. It needs a signal in that form. I figured the signal from the GM DIS was a 5 volt square wave but just wanted to make sure.

      Thanks for the response!

      -- Scott

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      • #4
        i think the tach signal is a 12volt signal. but it also depending on the module might also be a 5volt ttyl and putting a tach on it will make the module go crazy

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