Mystery Tachometer

[frickenbored]

Hi everyone, after a ridiculous amount of online research and coming up with absolutely nothing I decided to join a forum and hope that someone else has seen this gauge before. So I'm in the process of "restoring" my 1986 Chevy K10 Scottsdale, after 8 long years I've finally found the time to install the engine I rebuilt 5 years ago and the transmission I rebuilt 2 years ago. The truck now runs and drives and to my surprise all of the factory gauges actually work, they just needed to be hooked up to sending units. I've got the voltmeter, temp, oil pressure, clock, and fuel gauge working and I have my eye on the factory tach now.

This tachometer has the fuel gauge built into it, I can't find anything about this gauge anywhere, it's like it doesn't exist. Every gauge cluster I've ever seen either has the large fuel gauge next to the speedometer or they have a single tachometer and a small fuel gauge where the clock is. I haven't actually pulled the cluster yet to see how the tach is wired, for now I'm just super curious as to where this gauge came from.

Also, this truck has the body of a 1986 C10 and the frame/drivetrain of a 1975 K10 but these gauges look like the 1980s style to me.

(sorry for the crappy pictures, it's a pretty sunny day)

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[bucket]

It's from a medium duty truck. A nice upgrade if it still works, imho.