I rented a PA 28 once, the compass didn't work at all in the climb cos there was a fluid leaking all over my knee and the DI didn't rotate whilst the aircraft was climbing either! I got in so much trouble with ATC that I will never fly an airplane again if the compass and DI are both on the iffy side! The aircraft only had one com as well but that's another story but at least the donk didn't pack up!