[Vwdiesel] VDO gauge adapters

Ron Schroeder rjs at bnl.gov
Tue Apr 26 12:36:58 EDT 2005

Hi Shawn,

If it's tapered and "almost" NPT then it is most likely BSPT (British
Standard Pipe Tapered).  They are exactly the same dimensions except one is
27 threads per inch and the other is 28 threads per inch.


----- Original Message ----- 
 Date: Mon, 25 Apr 2005 22:14:35 -0700
> From: "Shawn Wright" <swright at zuiko.sls.bc.ca>
> Subject: [Vwdiesel] VDO gauge adapters
> To: vwdiesel at vwfans.com, diesel-Vanagon at yahoogroups.com
> Message-ID: <426D6BCB.23765.905D89D2 at swright.zuiko.sls.bc.ca>
> Content-Type: text/plain; charset=US-ASCII
> Well, I got my box of gauge goodies today, oil temp, pressure, and boost,
> from CIP1.com. Also included are the oil temp sender #323 423D, which
> says 300F, M10x1, and a T #240 850D, which also says M10x1 "VW
> Application" on it.
> However, it appears the temp sender uses tapered threads, likely 1/8"
> NPT, which will go in 2-3 turns before binding. Also the T uses the same
> taper on the male portion, but it correct M10x1 on the two female ports
> (confirmed with a VW oem sender).
> This seems very odd to me. Is there such a thing as M10x1 *tapered*
> thread, and if so, is it the same as 1/8" NPT? Is it safe to force a
> thread into a straight sender hole? (if so, what torque is safe?). Or did
> somehow mess up?

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