Used the spare bulb holder for the oil light in the spare green hole next to the neutral light to come on when the grip heaters are on. Thought I'd use it
Could just use the oil light on the speedo if you wanted to
Use a speedo cable adapter like this to get mph. A bit expensive, but I've used them to modify Serow kph speedos and they appear accurate. Just put a mph sticker over the kph mark, otherwise confusion may occur!