I have one in my box of parts to install that was intended for a diesel. I think it tops out at 4K, maybe 5, I don't remember for sure. The wiring is not the same as a standard tach, though so I'm not sure it will work.

Devin

If you can't hose it out it ain't a truck

55 3100
63 Corvair Monza
64 El Camino
72 240Z
01 Suburban