anyone done this swap or know whats involved?

might put my evo back to stock but looking for low mileage motor to put in and obiously the newer 9 motors are lower mileage.

engine bay harness to ecu, motor, ecu..... anything else needed for swap?

will all gages etc work or is there more that needs changed/am i over simplifying it?

seems like not much difference in motor prices so maybe if i were to throw an evo 9 motor in it, maybe it would sell easier/for more