Very easy for all of us too!easy ?
remove from tractor,sit on bench, power it up, apply appropriate signal to the 'engine is running' input lead of the meter.
would need to see wiring diagram to figure out WHAT that signal is.
another option, if meter has CANbus interface(actually ANY communications interface) , access the 'hours' register and rewrite whatever time you want in it.
both of these are 'easy' for me....