I guess I should have asked 1st how is the tach supposed to be wired?
Does it need 12 volts to make the tach work?
Don't know what Hyperspark is.
Stock just uses a wire to coil and a ground wire.
A 12 volt source is just used for the light. (usually for nighttime)
3 wires total. (unless housing is the ground then just 2)
Also what car and year?
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