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tach help please

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NoSmog73, Nov 18, 2001.

  1. NoSmog73

    NoSmog73 1/2 ton status

    Sep 28, 2001
    Likes Received:
    ok here goes I just got a new tach and hooked the wires like it said (black to a good eng. ground , white to the panel lights,red to 12v switch on fuse panel, then green to the neg. on the coil ) well when I turn the key I can see the gauge move a little but no working tach. took the tach apart and started the blazer and tested the tach board and they all have power do you think it is the gauge or is there another way with a stock ignition set up to hook it up or just take it back and try a new one?????
  2. Thunder

    Thunder 3/4 ton status

    Jul 20, 2000
    Likes Received:
    Northeast Nevada
    Looks like you hooked it up right. Prolly a bad tack. Take it back and try a new one.

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  3. newyorkin

    newyorkin 1 ton status Premium Member

    May 8, 2001
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    Los Estados Unitos
    Do the lights on the tach work? Could be the ground, but if you see it jump a little when you turn the key on, then I'd guess it's completing a circuit. The green wire definately have a good connection? Can you test it's input to the tach? I had an identical problem when I moved my tach from my '73 dodge to my '88 K5 (they were about 5 years apart, so the instructions were long gone when I did it), and it turned out to be the ignition (coil) lead reversed with the tach power lead.

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