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 ?

    hector
     
  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 Buick Hunter 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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