Yeah just replace the sending units with the units for the mechanical gauges or find you a T that you can use with the sending unit and mechanical gauges.
Look in the how to's for a step by step guide but as far as modding something the only thing I had to mod was the corners so they would accept my factory bulb holder. My bulb holders were a little bigger than what the 01-03 corners wanted to accept.
Trucks on power block tv did the 4.6l swap in a Mazda b2500(ranger) I believe they did it in an 01 and they had to do a but load of mods to get it to fit and even after all the mods there where several issues that I would think would end up being clearance issues later on down the road.