Ok, so I bought a 2005 boat with a 2015 Yamaha VMAX sho 250hp on it. The SQUARE fuel management gauge is sunburnt and not showing any info, stuck on 38 gallons capacity, and mode and function didn't do anything. OK. The SQUARE tach ( 6y8-8350T-01-00) worked perfectly. Well I took the boat out Saturday and the tach reset once.....but worked fine otherwise......I ran the boat on Sunday and after a few hours, the tach showed a dash for tach, and no info for any of the other functions.......it scrolls through the different pages no problem. So I checked all of the connections, even ran 2 jumper wires from the plug on the motor to the gauge and it didn't change anything. Where do I go from here? Most people tell me that Yamaha ECM's are bulletproof, so I'm leaning towards the gauge being the problem. Unfortunately I don't know anyone with a gauge I can try right now. If it's commonly a gauge problem, I'll buy one.