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  1. #1
    Jr. Mechanic BluBurb89's Avatar
    Join Date
    Jul 2009
    Location
    Port Orchard, WA
    Posts
    114

    Default Tachometer wiring question

    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?

    1989 R1500 Silverado Suburban
    5.7L, TBI w/ Dual remote oil filters,
    16" 2010 CFM E-fan, K&N filter
    TH700R w/ Aluminum pan, remote trans fluid filter and aux trans fluid cooler
    Air shocks rear,
    7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
    Cuz....I like to move it, move it....
    Semper Fi!

  2. #2

    Default

    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. #3
    Jr. Mechanic BluBurb89's Avatar
    Join Date
    Jul 2009
    Location
    Port Orchard, WA
    Posts
    114

    Default

    Tim,
    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.
    Ted

    1989 R1500 Silverado Suburban
    5.7L, TBI w/ Dual remote oil filters,
    16" 2010 CFM E-fan, K&N filter
    TH700R w/ Aluminum pan, remote trans fluid filter and aux trans fluid cooler
    Air shocks rear,
    7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
    Cuz....I like to move it, move it....
    Semper Fi!

  4. #4

    Default

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

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