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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Dec 2006 Posts: 720 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 720 | Been pokin around lookin at various parts on E-pay for a tach for the big ol beast. I'd really like to find a factory part, but I've pretty well given up hope there. I found myself a 12V 6-banger signal generator for a Sun Tach. Was wondering if anyone has adapted one of thier tachs to fit in the right side hole on the stock GMC dash panel & had some pictures? Just interested if anyone else had gone that way as it seems to be where I'm goin with this part of my insanity. 
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber" 2007 Chevy Avalanche 2020 Jeep Cherokee Trailhawk, 2005 Harley Davidson FLHTCUI I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | A built in tach that fit in the right hole was an option on a 450 series and larger. 450 used a 302 6 cy. 550 and 600 series used a V8. From there on up the gas burners were the big 6 cy engines like the 503. | | | | | Joined: Oct 2009 Posts: 31 Apprentice | | Apprentice Joined: Oct 2009 Posts: 31 | I got my truck with a sun tach already mounted into the opening. I rebuilt it & installed a matching face identical to the speedo to make it look original. | | | | | Joined: Dec 2006 Posts: 720 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 720 | Thats pretty uch what I'd like to do, not a real fan of mounting it on the steering column.
1956 GMC 370 dump " 'Tater "1970 VW Volksrod "the Black Bomber" 2007 Chevy Avalanche 2020 Jeep Cherokee Trailhawk, 2005 Harley Davidson FLHTCUI I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P
| | | | | Joined: Feb 2004 Posts: 29,803 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,803 | The Sun electronic tachs that were used in the 1950's and early 60's had a sending unit that looked like a big voltage regulator, with a brown Bakelite cover. I believe some of them were dealer-installed as an option on medium-duty trucks back then. They used a set of Mallory mercury batteries in an oddball voltage, and those batteries went obsolete many years ago. I've seen original-appearing systems that were actually rebuilt with modern electronics, but I don't recall what company was doing the conversion.
Jerry
Last edited by Hotrod Lincoln; 11/21/2009 4:28 PM.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2006 Posts: 24 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2006 Posts: 24 | Sun Tack
I sent my Sun tack to Willimson instruments in Arkanas they did a change over to coil or HEI and it was about $200.00 worked real good and they cn rebuild about any inst or guage. Hope this helps. PS I think its Willimson Instruments .com I think ? Sam T | | |
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