Tachometer wiring question

Discussion in 'General Chevy & GM Tech Questions' started by BluBurb89, Jul 26, 2010.

  1. BluBurb89

    BluBurb89 Rockstar 100 Posts

    I have an older style 60's Dixco Model 47 tachometer that I want to use. Does anyone know if I need to run a ballast resistor from the HEI coil tach side?
  2. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    I dont know if you need to run a ballast resistor but I'm curious as to where you dug that antique up from.
    I thought with the HEI system the voltage was considered to be constant and regulated when the coil was live, which would mean you dont need a ballast resistor in-line, but please dont take my word for it I havent worked on something like that for at least 15 years.
  3. BluBurb89

    BluBurb89 Rockstar 100 Posts

    At garage sale; it was on the table for $10. It wasn't working; I took it home replaced a resistor, soldered a wire and was good to go on a friends '64 Impala.
  4. Chris Miller

    Chris Miller Rockstar 100 Posts

    You don't need a ballast resistor on that 89. It's a computer-regulated system.

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