Yup the hour meter on my Grandad's IH Super M is a toy to amuse my feeble mind. To think of the hours he spent in that seat... am amused for hours.
There is a plethora of cheap junk Chinese hour meters available. Many won't sit in their packaging a year before the battery dies. But that is OK, changing oil by engine run time is a Conspiracy Theory brought to you by the Cheap Chinese Hour Meter Consortium.
At least one hour meter on Amazon has a replaceable battery. But at $25 it might break the bank vs the 2-for-$8 meters.
My Country Clipper hour meter times off 12V but has internal non-replaceable battery. Does not use a spark ignition sense wire.
There is a plethora of cheap junk Chinese hour meters available. Many won't sit in their packaging a year before the battery dies. But that is OK, changing oil by engine run time is a Conspiracy Theory brought to you by the Cheap Chinese Hour Meter Consortium.
At least one hour meter on Amazon has a replaceable battery. But at $25 it might break the bank vs the 2-for-$8 meters.
My Country Clipper hour meter times off 12V but has internal non-replaceable battery. Does not use a spark ignition sense wire.