you need to get a clutch along with it.. it should still have the clutch and pulley on it. you'll need a line going out of it to your tank and you'll need a fitting for that. also need a check valve. you need a pressure switch. you need to make a bracket for the side of the motor or get rid of the AC and mount yours like i did mine, in the stock AC hole using the bracket from
www.onboardair.com
oh, dump the oil out of it that is in it when you get it.. unscrew the plug hole and dump it, go get some non-detergent oil to put in it..