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Here is one possible source for the air operated brake light switch: http://www.ucominc.com/partkits/7006.html I have not dealt with this vendor, so investigate before purchasing. Ironically, this was suggested by the OP almost exactly two years ago -->

A photo of the air switch and a PS magazine article for ref.

It sounds like the Echlin SL134 has worked for you, but others have noted that it's specifications may inadequate. Here is the caution: http://www.steelsoldiers.com/showthread.php?30902-Brake-Light-Switch-WARNING

Please take a moment to think through this safely. I always get nervous when we give quick-brake-fix-ideas to someone on an internet bulletin board. I see you have been a member for over 3 years, so you should be pretty familiar with your truck . . . - but maybe this might help you or the next...