I had the same problem, never went over 3/4 full and dropped well below the
red zone when empty.  Useless.

David could just cut and paste links to his responses from the archives for
nearly every question anyone ever asks.  But since he likes the personal
touch, I'll do it for him:
http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind1304D&L=vanagon&P=R90

Everything checked out electrically for me, so ordered the guage from Van
Caf� for $36 and all is fixed.  I have a tach, so taking that gauge out is
tricky, and I broke the needle even with the advanced spoon technique
because it was on so tight.  I was able to fix it though, but I did not want
to do that three or four times to calibrate it.  If you have a 10v source,
you could bench calibrate it with the resistors David mentioned (or another
sender).  It was worth the $37 to me.  (Early gauge is $51 though.)

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
ralph meyermann
Sent: Saturday, July 27, 2013 5:38 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Fuel level gauge

Hi gang! I recently installed new fuel tank and sending unit and with 12
gallons approximately of fuel its showing about half a tank. Is there some
adjustment I can do to calibrate it?
Velma 82 na diesel westy