I bought a 1979 280CE (92K miles) about a month ago. Everything's been well with it and I've been enjoying reading your BB and other newsgroups (basically, getting prepared for when i have to ask for advice).

Two days ago a light on the dash. It looks like a two concentric circles (like a donut) with dashed lines around it. I don't have a manual and I've never seen a light like this on another car. My guess was that it was a "bulb-out" indicator, but all the bulbs are fine. Anyway, what's the light mean?

Also, can anyone tell me how much gas is left in the tank when the Reserve light comes on?