I am already changing the fuel sender unite to the gas tank 1989 300-E because it sticks and will not give an accurate fuel tank reading. I was told the orange warning reserve light that is suppose to show low reserve fuel in tank doesn't function, could be a bulb or related to the fuel sender unite I don't know? Do I need to pull the instrument cluster to check the gas gauge ? What steps to I follow to do this proceeder? can I check with a low amp DMM?

I went to check the forum and found the directions to pull the instrument cluster if need be. On 1989 W124 models if you turn the key to the on position to light the warning lights up is the fuel low warning reserve lite suppose to come on though I amagine it would and if not that would point to a bad bulb am I correct? Is this bulb accesssable with the instrument cluster once out or is it internally built into the gas gauge?

I thought of another important question. Should I disable air bag when extracting instrument cluster? How is this done , do I need to do this ? Very Very Important!!!!

This forum is great:
Bob Geco
family car 1989 300E 170,000 miles