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Old 06-26-2005, 09:38 AM
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HEI and factory tach

I have a 64 impala with factory tach. I have installed a HEI distributor and I can not get the tach to work with the factory wiring. How do I wire to the HEI when not using a coil?

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Old 06-26-2005, 09:44 AM
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tach wiring

The tach wire hooks to the HEI next to the power wire in the cap.

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Old 06-26-2005, 02:11 PM
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As stated, the tach is connected to the distributor next to where the power connector is. If you look closely at the HEI cap, it should be marked "tach". You'll need the special plastic clip to hook it up correctly. You can probably get those at Chevy or at a local boneyard. Failing all else, I'm sure you can buy them from Painless or Dick Francis.
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Old 06-26-2005, 09:00 PM
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Doc here,

In addition to what was already said...

Be sure you Don't have an External Tach amp board...some of those older Chevy Stockers Did...If you do, be sure power and ground are also hooked up to it..In addition to the Tach wire From the HEI terminal located Next to the BATT Terminal...

Some of those old tachs also required a "Wave Shaper" Buffer that mounted on the Tach Pickup wire (usually on the right rear of the engine next to the distributer) Looks like an ignition Cap...but it isn't...

Be sure if your system requires one, get or hook one up...or your tach amp will die prematurely..only a few required them, and of those, mostly vettes..but of factory stuff...you never know..worth a look..

Doc here
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