do the ones with gauges automatically detect what range it should be pumped at or is it different for different wheels? i'll definitely get one with a gauge as a guide as i have no idea how much is too much.

also how often should i be cleaning the bike? i hear you should remove and clean the chain every so often for example. considering i don't know how to take it off/put it back on i haven't done that yet in the time i've had it. bad?