I have a problem with the temperature gauge on my 1990 735i the neddle does not move, i have taken the gauge and fitted to the petrol gauge side gauge of the dash and it works also checked at the sender unit, I have 4.8 volts at the plug also the sender unit resistance goes up and down with heat of the water. Can any body help? Also what can you use to clean the alloy trim around the windows the roof line Hope someone can help Mark