Bad connection on the back of the cluster for the permanent live?
Would work when the cars switched on but as soon as you turn it off, the permanent live wouldn't cut in to save the settings, wouldn't affect anything else
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold