throwing this in kinda late about the aux tank travis mentioned. if you need a cheapie just go to lawnmower repair shop and get one from a junk riding mower. i use one with small rope looped around it and hanging from a beam in the shop. also the manometers work good. i have had a set of the mercury ones for over thirty years that still do the job. i have never used the gauge kind though to be fair,so i couldn't tell you there. just buy the best quality that you can,,i can imagine the cheapies would be crap. also for what it is worth,,harbor freight has a good chain breaker for under 10 bucks,and timing lights for twenty sumpthin. when you get a set of feeler gauges for the points,,spend the extra few dollars and get the longer ones that are curved instead of straight,it's easier to set the valve gap with those.