It's my understanding that the tachometer is standard on the newest vehicles. It's made by Dixon Instruments and includes an hourmeter in addition to the tach. They occasionally come up on eBay, that's where I got mine. I haven't installed it yet because I haven't picked up a mounting bracket for it yet. I believe that a Sun tach housing would be a good mount after being painted green. I think it can use the tachometer pickup on the back of the engine block where a distributor would normally be on a gas engine.
FTM2 USS Long Beach CG(N)-9
US Navy, 1969-1975
1986 M996A1 HMMWV ambulance w/ Kasel M101A3
1977 M880 Dodge Crew Cab
1966 M274A2 BMY Mule
1965 M151A1 Mutt w/ Stevens M416B1