Wanderlodge WB40 Trans temp sender unit

[Pete]

Looking for suggestions on locating a sending unit for my 1991 WB40 Wanderlodge.

This Wanderlodge has the 8V92 detroit with the 745 allison w/retarder. In my
Wanderlodge manual it shows this as "Sender oil temp, Transmission with
retarder" Part# 1197920.

Is there a place that still has some Wanderlodge parts inventory?

If not....would you think this is a "detroit part", "allison part", "wanderlodge
part" or "Bluebird part".

Any suggestions appreciated. Thanks, Gerald