not going to scold you, but I did post an identical sounding problem a ways back (2011 or 2012-ish)....
turned out to be some little micro switch under the dash, on the pilot side.
I tried micro switched in well wells, cleaned all contacts, replaced hoses, etc...turns out that little switch which somehow was moving with the cable or wire it was attacheed to, because it had broken free of its mount point.
sorry I don't have more info, but that's what I remember...it is a 1968 T337C model.
http://www.337skymaster.com/messages...ead.php?t=2746
http://www.337skymaster.com/messages...ead.php?t=2951