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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!
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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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| | | | | 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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