make sure your gauge reads high enough, these motors put out over 100psi of oil pressure. honestly not exactly sure where the oil pressure sending unit is, but i believe its built into the front cover, or in the oil pump iirc.

youre going to need to run the one that came with the gauge because the stock one is not going to have the same pressure/voltage values that the gauge is calibrated for and the stock oil pressure sending unit is on a canbus/

water temp, the coolant temp sensor is to the left of the upper radiator hose. but again, youre going to need to use the one that came with the gauge, as the stock one is part of the canbus system and you cannot tap it to read what youre looking for