Hi Drew.  In my '90, the fuel gauge seems calibrated correctly.  I am 
in Canada, and I fill in litres.  I have had it into the red zone, 
and put in 63 litres once (just into the red zone).  The tank is 70 
litres, so I would think that the gauge is accurate.

 
> Here's question for the other Syncro owners.  When my gas gauge reads 
> almost to the bottom of the reserve area, it only takes about 16 gals 
> to fill the tank.
> 
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Harry yates         Internet: hyates@bcit.bc.ca
'90 Syncro Westfalia          Burnaby, BC
'87 Golf Diesel