R33 Speedo Not Reading Correctly. Easy Fix?

[Ruthr33]

Hello. I have converted my s2 r33 sedan from auto to manual. Still has auto diff in. I don't want to change the gearing. I still have the auto dash. Everything is working fine except the speedo reads about 120 when I'm doing 100kph. I've searched for solutions but I can't find an answer. This conversion would have been done a million times. Does anyone have any ideas. And will this affect my power fc when I get it tuned?

[Victory]

The manual gearbox comes with a speed sensor that is designed to run with a 4.1 diff and your auto diff is 4.3 and this would be causing the speedo to over register.

A N/A r33 runs a 4.3 diff so would a speed sensor from a manual N/A gearbox solve your problem.