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Old 10-24-2004, 02:10 AM   #1
rage'nrat638
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installing a stock tach with H.E.I.

ok. i hear tell that a stock tach won't work with a hei because of the higher voltage!!!!!!

be that it may !!!!!

here's what i would like to do.......
install a resistor in line on the 12 volt wire feeding my TACH from the hei....so i can run a stock tach......
this is the resistor i would like to use.......
MDS PN 8214


restated question.....thanks guy's......

Last edited by rage'nrat638; 10-24-2004 at 02:26 AM.
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Old 10-24-2004, 02:13 AM   #2
Russell
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Kinda defeats the point of installing a high energy ignition if you ask me... I'd put the voltage regulator between the tach and HEI if possible...
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Old 10-24-2004, 02:17 AM   #3
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The tach will work with the HEI from what i understand.
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Old 10-24-2004, 02:21 AM   #4
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mark that hei needs the full 12 volts to work properly you cannot run it on the 9 volts after that resister
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Old 10-24-2004, 02:22 AM   #5
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Works just fine for the one I have installed.
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Old 10-24-2004, 02:24 AM   #6
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Ok I Wanted To Say Putting The Resistor Inline With The Stock Tach .....

not The Hei
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Old 10-24-2004, 02:28 AM   #7
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Quote:
Originally Posted by jhow66
Works just fine for the one I have installed.

so your running a stock tach....with HEI !!!!!!!!

well thats great.....if i am understanding you correctly......
i just don't want to smoke it....
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Old 10-24-2004, 02:33 AM   #8
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3 of my trucks have stock tachs and HEI
no problems
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Old 10-24-2004, 02:38 AM   #9
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i would tend to think a resister between the hei and tach would screw up the tach signal and make it read improperly
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Old 10-24-2004, 05:44 AM   #10
JimKshortstep4x4
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Smile

We have been running stock tachs with HEI on (11) vehicles, (7 trucks and 4 cars) for years with no problems. My son sold his 71 Chevelle which has the stock tach/HEI setup and it was the oldest installation that we had, (14 years and still working).

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Old 10-24-2004, 08:01 AM   #11
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So. If I have a stock tach, and HEI, will it work? I'm Canadian you know, we're on the metric system here.
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Old 10-24-2004, 08:27 AM   #12
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Thats why GM put the tach terminal on an HEI....so they wouldn't have to come up with a different tach for the millions of vehicles that have them....look at any vehicle in 74 and then in 75 after they changed to HEI....same tach
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Old 10-24-2004, 09:45 AM   #13
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My 72 had a HEI and I put in a stocl tach and worked great!
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Old 10-24-2004, 11:01 AM   #14
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You got yourself a hold of some darn bull crap info....Stock dash with stock Tach works fine with an HEI dist. No resistor, no nothing.....just the wire to hooooook it up.
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Old 10-24-2004, 12:26 PM   #15
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Thumbs up

thank you....thank you....thank you.....

will i can proceed with the monster garage 69 tach project

installing a vacuum gauge into this set-up as well...all hole's will be filled...
with useful motoring info....

i can't wait....need ot order a new dash dezal.....i am in..

thanks for the help and info guy's
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