ok, im trying to install an r134 ac system into my 92 civic hatch. I know the car came with R12 from the factory. The evaporator core is from an R134 setup and connector to it requires a 3 wire plug. The harness from the car is a two wire to the evap box. So obviously i have to get a different harness. My question is: Is this harness all i need to hook up my system electrically? Or will i have to change the harness in the engine bay also? Please help