F78 wireing gremlins

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First off my temp guage keeps telling porkys reads off the scale but not always and seems to go up with revs and back down again If I back off, but it isn't overheating.
second the dash warning lights come on and off on bumpy roads, this also cuts power to the radio just for a second. can anyone shed any light on this? I suspect this is due to a dodgy connection on the ignition switch but i am only guessing.
I have also bent the super low cross member guess its time to make a new one.