I'd check the road speed reading reported in Td5 ECU instrument mode before touching the wiring.
If that is ok then SLABS, wheel sensors are fine....
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I have a truspeed. Bought the last one 4x4 intellagance had in stock before they shut down.
Interstingly it had super lift markings on it. I purchased another one from super lift for my Kia Sportage (which I didn't endd up needing as a R&P change fixed the speedo reading) from America and it was the same model.
cheers Chris
The Hunter DI Spares C6100-4 work with a D2, several people here including me use one. Info here Fitted a C6100-4 speedo correction unit