This is the one I got. I like it because of the replaceable battery. Juse wrap the induction wire around the spark plug wire several times and your in business.
I have a pressure washer that's going to be 15 years old. I wish I had put an hour Meter on it when new. It's got a Honda GC160 engine, all original. It's on its 3rd pump. It hast to be getting up there in hours by now, it's had a lot of use between my family and friends.
Huh, I had never even heard of a vibration activated hour meter.
A quick google search, they do sell them, found one on Amazon and it lists "trailer, motors, machinery"
I'm thinking if they list them to work on trailers, road vibration would definitely activate them.
I think you'd have to stick with the inductive type if you haul your pressure washer in a car/truck or trailer very often.