[DW SD]

buy one from Jeg's or Summit Racing. Their's are modest in cost and pretty nice. I spent $60 to $80 or so on mine and you can narrow down to +/- 1%. The gauges have better accuracy, which is important, I think.

Note, you are supposed to check the engine hot, from feedback I got, it was not helpful to do a cold leakdown. I think the data should be correlate-able, personally, but not so from some of the expert engine builders I solicited for advice when trying to evalute a used motor. In the end, I did not follow my own instincts and purchased a motor with bad (cold) leak down numbers and ended up having to rebuild it at great expense.

Doug