2000 speedster fuel gauge wiring

[Igetwet]

I need some help. Before I took ownership of this boat some one was messing around with the wiring to the gauges. The part I can't figure out is there's a Bosch relay in there with a male connector and a female and I do t know where this hooks up to. Is it part of the fuel gauge circuit? If some one with an early 2000s Merc powered not could take a look at there gauge wiring and help me out it'd be greatly appreciated!

 

[Dr Honda]

There shouldn't be a relay in the "Gauge" wiring. On that boat, it's probably a 3 wire sender. ground. one wire to the gauge, and one wire to the low fuel warning.

The only relay is on the lift pump, and it's mounted to the side of the engine.