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01-11-2025, 08:51 AM
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#1 |
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Registered User
Join Date: Sep 2019
Location: Dade City
Posts: 107
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72 Chevy truck dash tach question
Original tach dash, Does anyone know what this hole is above wire terminals?
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01-11-2025, 08:54 AM
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#2 |
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All stock and staying that way
  
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,500
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Re: 72 Chevy truck dash tach question
There was tape over it, but it is an access to the calibration screw.
__________________
1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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01-11-2025, 08:57 AM
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#3 |
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Registered User
Join Date: Sep 2019
Location: Dade City
Posts: 107
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Re: 72 Chevy truck dash tach question
Anyway to test tach before I install?
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01-11-2025, 10:17 AM
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#4 |
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Registered User
Join Date: Feb 2016
Location: Portland Oregon
Posts: 12,406
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Re: 72 Chevy truck dash tach question
Know any with a distributor machine? It would be the best way to check the calibration over the RPM range.
It's also pretty easy to hook the tach up with some temporary leads under the hood. You can verify the calibration with a new style digital timing light or a dwell meter.
__________________
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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01-11-2025, 10:29 AM
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#5 |
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Registered User
Join Date: Sep 2019
Location: Dade City
Posts: 107
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Re: 72 Chevy truck dash tach question
thanks for the help
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01-11-2025, 11:40 AM
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#6 | |
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The Older Generation
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 26,743
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Re: 72 Chevy truck dash tach question
Quote:
Just connect the wires to the tach output on an HEI or coil on regular distributor and positive terminal on the battery. I think you also have to connect a ground wire to one of the small screws on the back of the cluster to provide a ground for the the tach. I can't remember off the top of my head which wire goes where.
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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01-11-2025, 03:07 PM
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#7 |
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Registered User
Join Date: Feb 2016
Location: Portland Oregon
Posts: 12,406
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Re: 72 Chevy truck dash tach question
It should be like this if you have an original factory tach.
__________________
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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