After searching the forum I realise that a faulty fuel gauge is a common problem on the is200 but mine seems slightly different.
I've only had the car a couple of weeks so have only been to the petrol station twice in that time. When I collected the car the gauge was showing almost empty so I called at a petrol station and bought £30 of fuel. It wasn't until a few miles down the road that I noticed the gauge hadn't moved and immediately started to think I'd been robbed by the petrol station
As I was driving along I tapped the top of the dash near the fuel gauge and the needle moved upwards slightly. So I did it again, and again, and again, each time the needle moved about a mm finally stopping at about a third full. Must be a loose connection or dry joint I thought but when I came to turn off the ignition the needle didn't fall back to empty as it should and has remaind on a third full ever since.
I've just paid another visit to the petrol station and this time filled the tank. Again the needle didn't rise from until I tapped the top of the dash repeatedly, again moving a mm at a time until it showed almost full where it has remained ever since even with the ignition off.
Is there a fix for this that doesn't involve replacing the dash? I'm not against stripping down the speedo pod and getting jiggy with the soldering iron.