Mike,

The truck didn't have a tach. It had a place for it, but it was blank. It had all the other gauges, air, oil, water, ammeter, but no tach.

But it was probably maxed out to what a 478 goes to at 62 MPH. I'd have to look it up to be sure.

Bill


'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan