No, there's a different sensor for the gauge in the instrument cluster.

Good advice from mak on the fuel and OVP relays. Both can develop bad solder joints, just enough so that they break contact as they flex from heating up. So, they seem fine when cold, but unpredictable when warm. They should both be considered routine maintenance items for replacement, along with plugs, wires, cap and rotor, air and fuel filters.

__________________
1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't