Tach Hookup - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 3 (permalink) Old Aug 14th, 00, 7:37 PM Thread Starter
Join Date: May 2000
Location: Santa Rosa, CA, USA
Posts: 2
I have a Mallory Comp 9000 electronic dist(series 91), a Promaster coil and a Hyfire box. The tach is a Stewart Warner with three connections: S=signal, Ign=Ignition, G=ground. The tach instructions say the ign. hookup goes to a 12-volt source when the key is on, the signal hookup goes to negative side of the coil, and ground is for ground. The hyfire instructions say if using a tach to hook to the trigger on the hyfire box. The instructions for both the tach and hyfire are not real clear which wire goes to trigger.
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post #2 of 3 (permalink) Old Aug 14th, 00, 9:07 PM
Join Date: Nov 1999
Posts: 330
Signal is the wire that sends the pulse info to the tach from the ignition box.
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post #3 of 3 (permalink) Old Aug 15th, 00, 7:57 AM
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Location: Dallas, Tx, USA
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From trigger on hyfire box to signal on tach.

Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)

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