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The others already answered. The nice thing about making the fuel gauge permanent (not necessary) is that you can find out if you are having a fuel delivery problem. Whether or not these trucks were turned up before you bought the truck vary. On this forum people have found fuel buttons from a...

Need a EGT (exhaust gas temperature) gauge first before adjusting the fuel. 1200F is max temps, preferably 1100F for sustained. Once you have that and want to adjust the fuel flow correctly: Dual fuel line mod Need a pressure gauge able to read 200psi+ Lower numbered fuel button Good video on...

Physically the pump will swap over and I'm pretty sure the injectors will as well. Boost and EGT gauges are good. Also when playing with the fuel system make sure the fuel psi after the pump is at or below 200psi. Higher than that and the lobes on the cam for the fuel injectors will fail (big...

Many of the internals won't transfer over from the small cam NHC250 to the big cam NTC400. Swapping the turbo, intake/exhaust manifolds, and jakes are a good idea to the nhc250. Make sure to install a EGT gauge and keep the temps below 1200F pre turbo, preferably below 1100F. If that's not...

On the 7.8L multifuel it would be a good upgrade, maybe as a bottom turbo in a towing compound setup on a 8.3L. Too small for the NHC250.