Duncan
I had a B5m with a 6.5, went down to a decent 7.5 and saw an improvement in my times.
Worth considering what car your son runs too? If you're both B5m probably not worth changing until you can change both cars?
Re the electrics and cutting out, I'd try and isolate that first as it might be necessary to buy something if you find the fault is in the speedo?
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