Same thing for the ECU, the hose is there to hang free, not be conectec. It's a barometer so it can compensate for the elevation the sled is at. It's fine the way it is. You're proplem could be stator related. You can either check the ohms spec on the stator or pull the flywheel to make sure its not that.
2010 AC SnoPro 500 - 1.75" Backcountry Track, 9t Super Sprockets
2005 AC T660 ST Green - (Build in Progress)
1996 AC 580 Mod Sled - AGLT w/ Fox Floats, TSL Skid, AAEN Pipe, Risers, 1.25" Shotgun Track