Brad, that would be a MIL or a Malfunction Indicator Lamp. It turns on when a trouble code is set in the engine computer. I am guessing that unless he got a Canadian import, Triumph just used the same speedo on all of their America/Speedmasters even if they are still have carbs. I think it's funny that the symbol they use is an automotive engine. Probably a law somewhere that says it has to be the same for all motor vehicles.
Dan
