For your car you'll only need a boost gauge. Oil press, etc aren't so critical and are harder to mount because you have to stick a sensor somewhere in the oil system. Water temp is not a bad idea, and is easy to mount, it's easy to just put a sensor adapter into the radiator hose, but to be honest it's not a biggie.
Endless SSM are good road/occasional track pads ut to be honest if it's your first few times on the track Bendix Ultimates will do just fine.