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Thread: Tachometer wiring question
07-26-2010, 02:03 AM #1
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
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7x16 dual axle cargo trailer; 10K Reese HD trunnion bar WDS, dual friction sway dampeners
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07-26-2010, 07:45 PM #2
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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.
07-26-2010, 11:39 PM #3
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.
07-28-2010, 11:49 AM #4
You don't need a ballast resistor on that 89. It's a computer-regulated system.
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