Running an F700 tach in an F250 IDI

[R Kingsbury]

Will the 35 x 100 RPM tach from the big trucks work in our pickups on the stock sender? if they do, where is the factory wiring usually ran from and were there trucks that didnt have said wiring? ...im concerned that in my attempt to fix the rats nest of wiring ive snipped and removed the tach wires

 

[Nero]

Tach is ran off of a sesnor off the injection pump gear housing. If your gear housing doesn't have the threaded holes, you'd need to swap it.
I see no reason why a tach off an F700 wouldn't work, it's all just Ferd guts in there.

 

[R Kingsbury]

ive got the sensor housing, as well as a sensor with the wires cut off flush on the sensor.... oh well it makes a good plug until i get the tach and sensor, and wire it back in. Half this trucks wiring is custom now anyways