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Gunsons gastester professional manual6/14/2023 ![]() ![]() More time than the instructions asked for, but this made for a very steady reading after calibration. I let the tester warm up for a full 1/2 hour. That way, you can let it warm up on it's own, while you go for a drive, warming up the car motor. I advise powering it, not from your car's battery, but from a separate 12v battery. It resists the heat, even for a long testing period.Ģ)- The Gastester gives accurate and repeatable readings *if* and only if you warm-up and calibrate it correctly. To this end, I used a 10' piece of 1/4' ID rubber fuel hose. The head unit must be sitting in clean air. You don't want the head unit anywhere near the tailpipe while testing anyway. It's way too short, and as such, melts under the heat of the exhaust. This sums up most of what other users have recommended, plus a couple of points I found out myself:ġ)- *****-can the plastic hose (for the sniffer probe) that comes with the unit. There is a nice little booklet that comes with the tester, but of course it doesn't tell you *everything*. ![]() First of all, I'd like to thank all the Gunson Gastester owners who contributed tips, and got me on the right track.
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