I ordered two of these and really liked the ease of install. One unit worked perfectly on a PW50 and is still working. The second unit wouldn't work on my riding lawnmower. I tried this one on the same PW50 beside the other one and it wouldn't work there either. My only concerns is it stopping while the engine is running, and doesn't get noticed. I will keep an eye on it for sure. Sent the faulty one back and was replaced. Haven't put new one on yet.