The best is to get an electro mechanical hour meter. I use quite a few at home for checking running hours of lamps, TV, computer, stereo's Ok I'm a meterbuff so I like to know what things are doing.
Get them on Ebay, new or used.

I do not like the electronic rubbish they try to sell with the so called non volatile memories. Wait in a few years with all speedo faillures in newer cars ( fun to come ) [Linked Image]

An event meter is good for a pump too for checking ON / OFF cycles,

The product of rotation, excitation and flux produces electricty.