Adding a tach

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Adding a tach

Post by WyldeBill66 on 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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Re: Adding a tach

Post by 77mali on 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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Re: Adding a tach

Post by 2fat2fly on 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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Re: Adding a tach

Post by WyldeBill66 on 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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Re: Adding a tach

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

Female connector will hook it right up for ya Smile
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Re: Adding a tach

Post by 77mali on Fri Feb 08, 2013 8:37 am

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Re: Adding a tach

Post by Joe73 on 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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Re: Adding a tach

Post by WyldeBill66 on Fri Feb 08, 2013 3:21 pm

Thanks to everyone who responded.

Bill

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Re: Adding a tach

Post by Biomedtech on 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

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Re: Adding a tach

Post by driveit on Thu Jun 20, 2013 11:36 am

Any ideas for a sunpro tach that the needle has stopped working?
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Re: Adding a tach

Post by dynchel on 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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Re: Adding a tach

Post by driveit on 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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