Tach Readings and HEI Modules - Team Camaro Tech
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post #1 of 6 (permalink) Old Feb 10th, 09, 07:42 AM Thread Starter
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Tach Readings and HEI Modules

I finally got the Camaro on the road this past weekend for the first time after 8 years. The Tach is reading way off. At 70 mph it read 4500 rpms. I have a 396, 350 hp factory cam, turbo 400, 3.31 rear gears, 2800 stall converter and HEI. Here's my question. In the attached post Hotrodsrj makes a statement about using quality HEI modules instead of the junk from overseas. Has anyone getting bad tach readings tried changing their HEI module? Did it correct your tach readings? I do not want to cut my wires if I can avoid it.

https://www.camaros.net/forums/showth...=tach+readings

EricE
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SS Coupe 396/325
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post #2 of 6 (permalink) Old Feb 10th, 09, 09:36 AM
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Re: Tach Readings and HEI Modules

Oh yes, '88 MCSS, stock dash tach w/ early HEI (pre-ECM), read 4200 [email protected] MPH.
Aftermarket tach added and reads right on the money, 3000 [email protected] mph w/stock tires/gear. This is with a GM module 4-pin inside.

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post #3 of 6 (permalink) Old Feb 10th, 09, 04:54 PM Thread Starter
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Re: Tach Readings and HEI Modules

Everett, did you change the module in your distributor and get your factory tach to work correctly?

EricE
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post #4 of 6 (permalink) Old Feb 10th, 09, 05:28 PM
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Re: Tach Readings and HEI Modules

Unfortunately, no, I haven't had the time to mess with it. I bought a used aftermarket tach from another forum member for $15, clamped it onto the steering column, hooked it up to the TACH terminal on the HEI and been using it ever since.

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post #5 of 6 (permalink) Old Feb 12th, 09, 08:45 AM Thread Starter
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Re: Tach Readings and HEI Modules

If I decide to put the filter in, can I put it between the coil and the HEI?

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post #6 of 6 (permalink) Old Feb 12th, 09, 10:56 AM
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Re: Tach Readings and HEI Modules

No, goes between the TACH terminal and ground.

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