Use an electronic tach designed for 24 VDC system. The tach wire is already run between the front and rear junction boxes...it's a white/black lead. There are other unused leads if the white/black has been used.
You cannot overrev the engine and the trans is generally going to shift whenever it feels a need, but, it's nice to watch a tach move. Won't serve much purpose.
I bought an Isspro tach from Rich at IBP, but have not installed it. I'm going to...may do it soon since I'm running wires again.
Use the "R" terminal on the alternator for a signal. Be sure and get the correct terminal on the alt. You may have a direct connection from the "R" terminal in the rear junction box on a relay.
You'll have to get the tach signal, ignition, and ground to the dash from the front junction box.
Others may have different ideas, but I"m going to install a fuel pressure guage so that I can monitor the condition of the fuel filters. That'll be bit more trouble to install, but it seems useful?
Cheers, JR
