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- - GMC Tach? (https://67-72chevytrucks.com/vboard/showthread.php?t=741753)

sanford66

07-05-2017 04:25 PM

GMC Tach?

2 Attachment(s)

Okay guys is this a GMC tach or is it for something else. Joseph

chevylookin

07-05-2017 05:09 PM

Re: GMC Tach?

This looks like a speedometer with the back cable input but it says RPM's. Strange. Maybe to an old motorcycle. Any markings on it? How wide is the lens?

padresag

07-05-2017 05:43 PM

Re: GMC Tach?

Quote:

Originally Posted by chevylookin (Post 7984012)

This looks like a speedometer with the back cable input but it says RPM's. Strange. Maybe to an old motorcycle. Any markings on it? How wide is the lens?

mechanical tach as used on some of the medium duty trucks
ron

sanford66

07-07-2017 02:41 AM

Re: GMC Tach?

Ahh, I see. I knew it was mechanical. The light duty trucks were electric I was thinking. I saw it on Craigslist and wondered what it was. Thanks, Joseph

padresag

07-07-2017 10:15 AM

Re: GMC Tach?

all diesels of this vintage used mechanical due to lack of ignition system to send impulses. some gas pots also used them.
here is another form of tach, which is the hand held by Starrett and this one has been around the family as long as I have been around. just put the black rubber tip on the end of the crankshaft(centre) and read
http://imagizer.imageshack.us/v2/128...923/62JmgC.jpg
ron

cryowagon

07-09-2017 08:06 PM

Re: GMC Tach?

International Harvester

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