Tach/fuel combo

ChevyGuyZZ572 said:

I am doing a 12v cummins swap in an 84 k20. I wanted to leave the 4 little gauges in the dash untouched but I also wanted a tachometer. I know there is a specific model of blazer with a 4k rpm tachometer but has an integrated fuel gauge in the bottom. I am curious as to what model of blazer had this and where I could find one. Maybe there are aftermarket options that are remotely similar to the stock gauges? I'm not sure. I would just buy a whole digital gauge cluster but I really like the stock look.

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bucket said:

You may have seen one in a Blazer, but that's not where it started life. Those fuel/tach combos were optional in the medium duty (C50 and up) trucks and were used with various engines and rpm ranges.

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ChevyGuyZZ572 said:

That makes more sense. The 4k tachometer was probably used in those bigger trucks with the 6.2 or 6.5 detroit.

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Turbo4whl said:

The 0-4K RPM tachs are the rarest of all the tachs that fit a squarebody. Used on 6 cylinder diesel engines with an injector line pulse sensor. Even if you find one, will not read correctly with anything but a 6 cylinder. Some older model GM trucks had cable drive tachs.

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Maybe you could get this to work, from a T60 truck.

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ChevyGuyZZ572 said:

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something like this. It would be perfect for what I'm using it for. The Cummins revs to 3k rpm max. Modifying the fuel pump you can get them to 4 sometimes even 5k rpm.

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ChevyGuyZZ572 said:

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something like this. It would be perfect for what I'm using it for. The Cummins revs to 3k rpm max. Modifying the fuel pump you can get them to 4 sometimes even 5k rpm.

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Camar068 said:

I forget who or where, but that tach can be upgraded to work with a higher rpm engine.

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