Ed, Ive had this conversation with you before ...
... I do not design Robot wars electronics which rely on sensitive Chips- I do have a modicum of common sense. As I have explained to you before, should any of the modules (for example the accelerometer) stop working, the 2 processors will simply work without them. Should 1 of the processors fail, the other one will take over its job. The whole speedos are designed for things to go wrong! Short of an axe chopping the thing in half, weve tried to think of every eventuality!