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Old 12-03-2010, 06:40 PM   #1
mikewarme
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tach guage

So i can't use a factory tach guage with HEI, right? Is there a aftermarket guage that fits the cluster that could be used? Or is it out of the question?
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Old 12-03-2010, 06:58 PM   #2
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Re: tach guage

I'm pretty sure that you can use the stock tach on an HEI distributor. Just hook it up to the tach plug-in. There's a thread on here somewhere about it.
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Old 12-03-2010, 07:20 PM   #3
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Re: tach guage

I have used them with HEI. No changes at all, just plugged it in.
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Old 12-03-2010, 07:48 PM   #4
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Re: tach guage

Quote:
Originally Posted by 71swb4x4 View Post
I have used them with HEI. No changes at all, just plugged it in.
x2,check your pm's
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Old 12-04-2010, 03:04 PM   #5
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Re: tach guage

This appears to be a sometimes issue, and may depend on the type of HEI. However, the tachs that don't work properly can be modified, so you don't need to throw away an otherwise good tach.

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Old 04-21-2011, 05:00 PM   #6
mikewarme
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Re: tach guage

Any other opinions? I wanna buy a new cluster with tach but am afraid I might damage it with hei
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Old 04-21-2011, 05:57 PM   #7
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Re: tach guage

you will not damage it with hei. i have run two trucks with factory tachs and hei. no problems.
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Old 04-21-2011, 07:34 PM   #8
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Re: tach guage

hei/tach no prob here either. Now I'm running factor tach w a ls computer
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Old 04-21-2011, 08:30 PM   #9
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Re: tach guage

same here, transplated 1975 454 with HEI in my GMC 3500 (longhorn), factory tach, no problems.
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Old 04-21-2011, 08:34 PM   #10
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Re: tach guage

every once in a while someone hooks up a 40 year old tach to HEI and it doesn't work. However, by design, it'll work.
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Old 03-28-2012, 10:11 AM   #11
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Re: tach guage

Ok guys its been almost a year since we touched on this subject here last. I installed a factory tach last summer. Only driven 300 miles. Tach worked great. Took cluster out to change temp guage and when I was done the tach didn't work. Was stuck at 2000 rpm. So I bought a new one from classic industries and replaced it. Realizing when I had replaced the temp guage I had bent the backing just a touch on the tqach and that was the problem! I installed the new tach anyways. Took the truck yesterday to a guy who tuned the truck real nice. Took my streetfire msd distributor and put it on a machine to set the advance and just really tuned it nice. Drove it 4 miles from his place with the tach working ok, and suddenly I smelled burning and here comes smoke from the cluster. Tach goes dead (along with my heart). Than a few min later it started working again. When at idle the needle jumps. So im sure something in the tach smoked. Could this guy have hooked his light wrong to the truck and smoked it for me? Other ideas?
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Old 03-28-2012, 03:52 PM   #12
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Re: tach guage

Reproduction gauges with tach, plugged into ramjet HEI has not worked.
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Old 03-28-2012, 04:43 PM   #13
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Re: tach guage

I'm using AutoMeter SportComp tach with HEI, no problems
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Old 04-17-2012, 12:06 PM   #14
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Re: tach guage

Quote:
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I'm using AutoMeter SportComp tach with HEI, no problems
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Mounted in factory cluster??
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