I joined this forum because our fire station has a 1978 Ford 7000 and we are trying to find an air pressure wiper switch (Trico). The one in our water tender is leaking a lot of air. We are not having good luck in locating a replacement. Thanks one and all.

 

Hi geofarm, hopefully you'll get an answer soon from your post in the large truck forum.
In the mean time drop into your local chapter and meet up with those folks too: New Mexico Chapter - Ford Truck Enthusiasts Forums