Speedometer speed sensor 1995 Dolphin DP32

[Panheadguy]

I have tested my speed sensor and found it defective. This is a hall effect , three wire sensor with what looks to be a weather pack type connection. It screws into the Allison 542at trans and sends an electrical signal to the speedometer.
Does anyone have a suggestion where to go to find one?
The gage manufacture is Datcon; I doubt they will have much interest in helping me with a part for a 20 yr old moho. The gages say "Oshkosh" on the face but are marked Datcon on the back side.
Thanks to anyone that can help me.
Guy

[BFlinn181]

Have you checked at NAPA or other truck parts stores? The age of the part shouldn't be a big issue, there are thousands of RVs, trucks, and buses using that part.

[Panheadguy]

Checked on line but Napa was no help. When I get back to WI I can take the part around as a sample.