Have a '92 Breakway, 190hp Cummins with an Allison, AT542, four speed tranny (all original equipment). Trying to locate the pressure switch going into the tranny that activates the reverse lights. I see three possibilities. Referring to the tranny facing rearward, on the left side (passenger side) something is mounted near where the gear selector cable is. Something else on the same side is near the tranny brake. Finally, something else that appears could be the switch is located on the right/driver's side.
If I can determine the switch location I can jump the wires to determine if the switch is bad.
Finally, can anyone suggest a site where I can order the switch for this tranny?
Thanks all.

...something like this???

http://www.schoolbusfleet.com/...c.asp?TOPIC_ID=25523

Great link.
I'm going to Napa.
By the way, for future readers of this forum topic, the tranny reverse pressure switch is located on the right/driver's side of the tranny with a two lead pigtail attached.

Sorry, thanks Doug. I would be nowhere without your-alls' help.

Napa p/n OP6624 worked great. Had to replace terminals with female spades. Was able to use "boot" and rubber bushing from original switch to have replacement same as original. Total cost $10.