Davren
might be easy for you but gobbledegook for me, also my car has the larger speedo and the LH red light comes on sometimes and I dont know what it is
If you have a 1971 500L you will most probably have the 'square' instrument cluster--if so, the red light on the LEFT of the panel is your 'low-fuel' light. This light is in addition to a fuel gauge and will flash on when the attitude of the car alters (e.g. braking or going round corners) and the fuel level is low.