I run my micro digital ignition box under the tank. Trick is to keep it on top of the frame rail (loads of space) and underneath it, cut a pice of plumbers solder mat and tie wrap that in place. Plumbers solder mat is a ceramic weave matting that stops heat transfer when they solder up copper heating/gas pipes. It's very cheap from the local hardware store (well it is in the UK) and can be used all over a bike - for example on the inside of fairings that are close to engines or exhausts...