Engine swap in fourtrak TDX

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Hi all, just wondering if anyone has advice for me. I have a Fourtrak TDX that i purchased last year and had to swap engine due to being run without oil. The Fourtrak i have is a V Reg and i put a P Reg engine into it. It runs perfectly apart from the temperature gauge, fuel gauge, reversing light and rev counter do no work. Had to take the old chip out of the injector pump and put on the p reg engine so that my existing key would work. Would be very grateful for any feedback.
Regards. Paul.