I ordered an adapter (10.0x1) from ACS.  This is the size I got off this list as to what is needed for the oil pressure gauge post.  Well... it doesn't fit, the threads are finer on the oil pressure gauge sender unit.  Sooo.. what is the real thread size for the Oil pressure gauge port on the 13B?  What is a good source for an adapter to go from the oil pressure port to pipe thread?

Wendell

   I make my own by cutting off the shank of the stock pressure switch and then drilling and tapping it to 1/8 inch.

 Ken

 

Excellent idea, why didn't I think of that? Will be using a new sending unit anyway.  Looks like the ID should be enlarged for re-drive oil.

 

Wendell