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Subject:Re: oil pressure problems,still
From:Kenneth Lewis
Date:Wed, 11 Oct 2006 19:08:58 -0400
FYI. The oil pressure switch has metric threads. NPT pipe thread is a
conical hole, which is how the seal is made. The metric hole has parallel
sides. The seal is made at the shoulder, not in the threads. The thread
pitch is also slightly different.
   This has always bothered me about the remote oil pressure switch extender
hose, which is also NPT.
Ken Lewis
http://neksiwel.20m.com/