a little rpm guidence please

I just bought this 87 suzuki samurai 5 speed from this guy on the way to drop my bro off at the gym, anyways, I went to go test it out a bit and ran in to the common problem of the "stuck in neutral shifter", easy fix thanks to this forum but I was just wondering something...since my zuk doesn't have an rpm gauge, I was just wondering if someone could give me an estimate or chart or something of the rpm's at different speeds....so when I'm climbing these's colorado hills at normal speeds (and in different gears), I wanna know what rpm's I'm doing...can anyone help?, thanks Phillip

Theres no way of telling what your engine is revving at without a gauge unless you can tell by ear.