Bench test a hood tach

Discussion in 'Wrenchin' Secrets' started by hvramesq, Jul 17, 2018.

  1. hvramesq

    hvramesq Silver Level contributor

    I came across a hood tach being sold cheap and took a chance whether it worked. Guy had it listed as a speedometer. It looks like a parts place repop and not oem. My GS455 has no tach whatsoever so I doubt I can connect without significant wiring. Is there a way to bench test the tach ?

  2. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    Maybe with an old school distributor machine?
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Significant wiring? Just connect the signal wire to the - side of the coil and ground the case.
  4. buick64203

    buick64203 Just plum crazy Staff Member

    if its a repro, it might require a power lead. Some of those repros are quirky. They work only when the headlights are on. This is where test leads come in handy
  5. 87GN_70GS

    87GN_70GS Well-Known Member

    Or if you have a signal generator...
  6. hvramesq

    hvramesq Silver Level contributor

    it has a wiring harness. will try connection coil/w ground.

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