GA WTB: 6 cylinder tach gauge or cluster

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Originally Posted by too much stuff

The V-8 and 6 cyl tachs are all 5k rpms. The only way to tell the difference is by the part number or stamp on the back, or hook it up and see what it reads.
4k tachs are mechanical and found in diesels.

I can't remember if the 6 cyl reads high or low in a V-8 truck. The one in my '72 Dually reads high and I'm wondering if it is a 6 cyl tach. I am going to swap it out with a known V-8 one and see what happens. I can put the one from the Dually in the Green '67 I6 250 truck and check it out.....

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