plug the exhaust ports, put the spark plugs in, plug the intakes with the gauge is one and the pump in the other.
Pump the engine up to 6psi and let sit for 6min. if it holds at 6psi you are good to go, if not pump it back up and start sprayin all the mating surfaces with soapy water. Dont forget the crank seals and the reed cage gaskets!!
I always do my compression tests cold and with the pipes on, not sure if the pipes make a difference though.