Jon,
Of all the senders I have worked with, the hole pattern is "keyed" so it only goes on one way. I already mentioned that I didn't undertand how he could try it two ways. I posted my guess just before you posted. Are you saying that the senders arrive and need assembly?...and can be assembled backwards?
FYI: we never go the Summit part number. I searched the Summit site yesterday for 1950 fuel sender and got 2000 hits.


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn