Wireless hour counter

Hi,

I would like to build hour counter which can remember value when I pull out batteries from the vehicle and it count hours when vehicle has power back.

This counter must be hidden in the vehicle - without display. Hours could be readed with other wireless modul.

Is there on the internet simular project or parts of this project where could I get help?
Is it possible to read more of those counters (different addresses)?

You can buy hour counter gauges - typically used on industrial plant or boats so engine run hours are measured. Fit under the bonnet.

If you want a techy solution have a look a 8266 plus a DS3231 battery backed clock.

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