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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Adding a tach

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Adding a tach Empty Adding a tach

Post by WyldeBill66 Fri Feb 08, 2013 12:35 am

I did this years ago on my 74 Monte Carlo, but can't remember how I did it. I want to add an aftermarket tach to my 75 Chevelle. It has HEI ignition, and I don't remember how to attach the wire to the coil for the RPM signal. The instructions are vague, so I would really appreciate any help.

Bill

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Post by 77mali Fri Feb 08, 2013 1:13 am

Hei dist should have a plug slot for the tach plug, s/b next to the other wires that are on there on the part of the cap that sticks out a bit.
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Post by 2fat2fly Fri Feb 08, 2013 1:37 am

77mali wrote:Hei dist should have a plug slot for the tach plug, s/b next to the other wires that are on there on the part of the cap that sticks out a bit.
It's the only unused plug in on the cap (next to the bat.) , piece of cake !!!!!!!!!!!!
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Post by WyldeBill66 Fri Feb 08, 2013 1:57 am

OK, thank you. I'll check it out this weekend and see if I can get it connected. I use a female blade connector to attach to it, correct?

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Post by Sleddogg Fri Feb 08, 2013 3:27 am

Female connector will hook it right up for ya Smile
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Post by 77mali Fri Feb 08, 2013 8:37 am

Adding a tach 83621_10
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Post by Joe73 Fri Feb 08, 2013 9:23 am

If I remember correctly the top of of a "stock" cap, where the batt wire connects, actually had the words BATT and TACH stamped on them. That would have been on AC Delco and Blue Streak caps that I've installed.
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Post by WyldeBill66 Fri Feb 08, 2013 3:21 pm

Thanks to everyone who responded.

Bill

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Post by Biomedtech Fri Feb 08, 2013 10:10 pm

Accel also makes a plug for the HEI dizzies with both the batt and tach wires, I picked up one for the peace of mind that it wasn't going to come loose from vibration. It's part # is Accel 170072

Adding a tach A3517010
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Post by driveit Thu Jun 20, 2013 11:36 am

Any ideas for a sunpro tach that the needle has stopped working?
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Post by dynchel Thu Jun 20, 2013 11:57 am

Make sure it didnt come loose off the dizzy, mine used to come loose pretty regularly but  now its hooked through the msd box.  also make sure its grounded, with the surface clean.afro
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Post by driveit Thu Jun 20, 2013 1:50 pm

Hooked up good to the "dizzy"  ( never heard it called that til recently.), but have no checked the ground.

Someone else advised that I check to make sure the needle was not stuck.  I have tapped on it and it seems to move freely.  

Would it still light up if it was not grounded?  It is lt, just no needle movement.
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