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Old 07-05-2017, 04:25 PM   #1
sanford66
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GMC Tach?

Okay guys is this a GMC tach or is it for something else. Joseph
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1970 Chevelle Nomad station wagon
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Old 07-05-2017, 05:09 PM   #2
chevylookin
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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?
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Old 07-05-2017, 05:43 PM   #3
padresag
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Re: GMC Tach?

Quote:
Originally Posted by chevylookin View Post
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
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Old 07-07-2017, 02:41 AM   #4
sanford66
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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
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1970 Chevelle Nomad station wagon
1966 C-10 lwb,250-six,granny 4speed
1966 C-10 lwb,factory A/C,Custom Cab
1954 Delray 2-door sedan [rat rod project]
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Old 07-07-2017, 10:15 AM   #5
padresag
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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

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Old 07-09-2017, 08:06 PM   #6
cryowagon
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Re: GMC Tach?

International Harvester
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