What is this unit behind the dash. 2002 pete 379

Took dash panel off with speedometer and such gauges mounted to it to find a water leak and found this unit back there. looks like a relay. And looks to be a 2 piece of some sort becuase there is a heavy gauge yellow jumper wire going from one unit to the other as pictured. Can’t be for starter. Starter relay is mounted to firewall on outside and starter solenoid is mounted to starter. Thanks

 

All that stuff is down on the floor my friend. There is 2 low air pressure sensors and changed them both out. This one puzzles me. And the fact that there is a pretty heavy gauge jumper wire on there

 

Ok thank you. Just good to know where things are and what I’m looking at if I ever have an issue somewhere. Thanks again