Hi Bengt,
yes, the fuel gauge is adjustable. Generally you need a special tool but there is way, to do it wthout this tool:
1st: Drain your fuel reservoir or drive as long, until the fuel reservoire is empty (prepare an spare can with fuel in your car
)
When I have to train a fuel reservoire, I do it like this: I drive the car until the reservoire is nearly empty. Then I dismantle the fuel return hose or pipe from the injektion and launch it into an auxiliary container or can. Then I keep the engine idling until it stalls.
2nd: Pull off the red knob for the checkcontrol in your dashboard.
Behind this knob you can find the adjustment screw for the fuel gauge.
3rd: Use a small screwdriver (2 mm wide, 50 mm long) and turn it carefully until the gauge indicates an empty reservoire. The adjustment screw has about 1/2 turn way in each direction.
