focus TDI Ghia strange readings!

Hi people,
Here is a strange one for you, have 02 tdi Ghia with strange temp and Fuel readings,when you turn the Ignition off the temp Gauge goes to
Zero, but when you remove the key it goes to Half reading and stays there...... or jumps up and down for a while then goes to zero! Simular problem with the fuel Gauge that goes to half full when you remove the key ?. All guages work normally otherwise, but i have noticed that the Temp Gauge takes a while to get to normal temp when driving sometimes. then somedays it doesnt happen. you remove the key and both Gauges goes stright to Zero
Any Ideas???
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