Trim gauge not working - Yamaha 200

[timjet]

Hey Guys, took the Bene out this morning and the engine trim gauge worked normally. Got some gas and noticed on the way back the gauge shows the trim in the down position. I trimmed the engine up and the trim works but the gauge does not. This is a Yamaha F200XB with analog gauges. Suggestions on where to start?

 

[jpertile]

Check the little arm on trim sender that is mounted on the motor. People say they are known to break. Wiring between trim sender and gauge good? Then gauge itself.