Onan Remote Panel 300-4546. The part is new old stock. Has a run-time meter and a battery charge gauge. Press the button down to preheat.
I believe this will work for quite a few of the newer Onan/Cummins diesel gensets.I apologize for the low light picture. You can see the connector in the bottom. There are zero hours on the run-time meter in case that's not clear.