Anyone know what this tac is from

A guy gave me this and a bunch of other junk. I was wondering if anyone can ID it? thanks

I'm thinking it is a marine tach. Usually, the hood over the top means it was meant to be shielded from the sun, as in an open boat. Also, the redline at 4500 is generally where boats peak out.

Could be wrong, but that is my guess.

Don

That makes sense because it has instructions on how to set it up for different # of cylinders.