Re: The Duchess Project: 1940 Super 8 Convertible Sedan

Posted by Packard Don On 2022/4/25 12:40:01

NPT threads are determined by the nominal inside pipe diameter and the thread pitch so, as stated, the switch is 1/8-27 NPT. The brass block, though, is typically not a standard item and was made specifically for this application so if your threads are worn, best to look for an NOS or new reproduction. With decades of tightening in the new senders, the brass stretches little by little until it gets to the point that the sender bottoms out before a seal has been made.