72 Hood Tach Stopped Working...???

Discussion in 'Sparky's corner' started by 72_GSX_Stg 1_Ragtop, May 25, 2020.

  1. 72_GSX_Stg 1_Ragtop

    72_GSX_Stg 1_Ragtop New Member

    This is my first post... I have a 72 GSX clone (VIN says Skylark). 455 Stage 1 motor, with a hood tach. Not sure if tach is OEM or aftermarket. Car has 500 miles on rotisserie resto. I have driven it 400 of those miles. Tach has worked just fine until it stopped the other day. Light for tach stopped as well. I opened the hood expecting to find a broken wire from the coil. But, it appears there's more to it than that. There's a plugged connection. I followed the wires into a harness on the fire wall. I stopped looking and have joined this forum in hopes to gain some troubleshooting tips, please. I can grab some pics if it will help. Thanks.
  2. 87GN_70GS

    87GN_70GS Well-Known Member

    As a check to rule out the wiring harness, unplug the connector and run a wire direct to the coil minus. Attach to the brown tach wire. The black tach wire will need ground

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