What is it from?

I got this at the Portland swapmeet for 5 bucks a few years ago just because it was cool looking...so what the hell is it from? There are no emblems cast into it and the only numbers are "Casting No 1586232" and below that it says "IMP-2-" after that is a circle with 9 lines coming out of it with "58" in the middle. It is heavy and has a side mounted speedo with a colored tumbler instead of a dial. The tumbler is green until 35mph, orange until 65mph then it turns red and it goes up to 120mph.

Author: admin