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05-15-2022, 11:17 PM
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#1 |
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Registered User
Join Date: May 2015
Location: MANITOBA
Posts: 48
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Will stock GM HEI work on an original Tachometer?
Has anyone had any experience hooking up a factory 67-72 tach dash to a totally stock GM HEI from the late 1970's/early 80's. thanks for the input.
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05-15-2022, 11:44 PM
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#2 |
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Registered User
Join Date: Oct 2020
Location: Albuquerque, New Mexico
Posts: 474
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Re: Will stock GM HEI work on an original Tachometer?
It does.
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05-16-2022, 12:11 AM
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#3 |
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Senior Member
 
Join Date: Dec 1999
Location: Spring Valley, Ca.
Posts: 1,136
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Re: Will stock GM HEI work on an original Tachometer?
Works great on mine!
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Smitty '71 Short Fleetside Spring Valley, Ca. |
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05-16-2022, 07:40 AM
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#4 |
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State of Confusion!
 
Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 47,216
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Re: Will stock GM HEI work on an original Tachometer?
The one on mine is not accurate. Have tried all the tricks mentioned to make them compatible, but the RPMs change and get off by over 1000 RPMs the higher you go in the RPM range. Works perfect on a non-HEI distributor, just not on the HEI.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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05-16-2022, 10:22 AM
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#5 |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,716
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Re: Will stock GM HEI work on an original Tachometer?
Not on my truck but the OEM knee knocker tach works with the HEI on my Chevelle .
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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05-16-2022, 03:15 PM
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#6 |
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Senior Member
Join Date: Mar 2000
Location: Saskatoon,SK,Canada
Posts: 2,476
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Re: Will stock GM HEI work on an original Tachometer?
Works good on my stuff.
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Saskatoon, Saskatchewan Canada |
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05-16-2022, 10:53 PM
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#7 | |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,351
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Re: Will stock GM HEI work on an original Tachometer?
Quote:
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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05-17-2022, 12:58 AM
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#8 |
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Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,295
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Re: Will stock GM HEI work on an original Tachometer?
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05-17-2022, 03:27 AM
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#9 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
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Re: Will stock GM HEI work on an original Tachometer?
Going the other way, my SunTach by AutoMeter works well. It's on a 292 L6 on a '68 C/10 Stepside shortbed in original 516 Orange.
Tach and coil work OK with stock Delco Remy HEI* parts. No interference. No signal-induced misfires. Play well together. Same tach worked well with points, too.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 05-18-2022 at 05:57 PM. |
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05-18-2022, 05:32 PM
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#10 |
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Registered User
Join Date: Feb 2011
Location: Modesto, CA
Posts: 2,189
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Re: Will stock GM HEI work on an original Tachometer?
As others mentioned... Mine reads slightly low at idle, and gets significantly farther off as RPM's increase.
There is someone making boards for these for half the price of a new one, but i've yet to pull out the tach and test the circuit components on the board to see if they're good. I'm hoping i get good news and find a resistor out of spec that can be changed for a couple bucks... but whose that lucky!? 
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