2002 u295 , my transmission temp dash gauge is not working. Is there any fuse protection that would be involved and if so where is the fuse located ? I have the 400 hp cumming with the allison 3000 tranny.
Have you checked that the connection to the sender unit is clean and tight?
I strongly recommend the Scanguage D. Trans temp is one of the four parameters that I have displayed at all times. I don't trust any of my dash gauges. You may have a problem with the blue/black mystery box that all of the dash gauges feed through.
Check at the rear bottom of the transmission. There are 2 large hoses attached to elbows, one of them has a sender with a wire that is supposed to be connected.
That sender has a finnicky connection, to bad it isn't a stud with a nut.