Tom,
It's 24mm.  I had to do that a while back :-)

Sean

> 
> Hi all:
> 
> I'm engaging in some wishful thinking and I'd like to tighten down
> the oil pressure sender in my '81.  Trouble is, it "lives" down in
> a hole in the tin, and I need a buy a deep socket; what size do I need?
> 
> 
> ---------------------------------------------------------------------
> Tom Young               young@sherlock.SIMS.Berkeley.EDU
> Lafayette, CA  94549    '81 Vanagon
> ---------------------------------------------------------------------
> 
> 

--
*****************************************************************
Sean Bartnik            Fahrvergnugen really means "push harder."         
sbart7kb@www.mwc.edu          
'81 Vanagon Westy                   

http://www.mwc.edu/~sbart7kb/myvan.htm
http://www.mwc.edu/~sbart7kb/tech.htm
'78 Owner's Manual:  http://www.conservatory.com/vw/manuals_nyx/
*****************************************************************