Hour/Use Meter Recommendations

I had trouble getting the motorcycle / ATV vibration hour meter to work on the Lightning compressor I had. This meter has a variable sensitivity setting and putting it on the hi sensitivity setting solved the not reading problems. I also placed the meter on what would be the bell housing where the electric motor attaches to the compressor. Worked well after that.
 
I have tried a Chinese-made meter that senses vibration but it didn't work. May be the vibration of my Yong Heng is not strong enough to activate the meter. Then I picked this one that senses AC voltage. Just connect it in parallel with the motor. Every time the motor is energized, the hours / minutes are counted. Should be much more reliable. I bought it from on-line shops in China. cost 5 bucks shipped to Hong Kong. 

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...I put this on after two months of already using the compressor. ... I probably should zero it out and start fresh.

May be you can put it onto the engine of your car and let it count to the number of hours recorded in your log before putting it back onto the compressor again. This is what I did to my hour meter but as it senses AC voltage, I just connected it to the wall socket.