Zac I guess you have a Bosch system, with 4 wires, I cannot remember what the 4th wire on the Bosch does, but you will have 12v + and 12v- I think the 4th wire may be temperature sensor but cannot tell you which one, the other is the output from the MAF to the ECU you cut this wire and connect from the MAF to the white maf amp wire, the orange wire then goes to the other wire you cut to the ECU, so the maf sends its signal to the maf amp which enhances it and sends it on to the ecu, hope this helps, Rick