TSDZ2 250w 36v with 500C Display instead VLCD5

Hi,
I have a TSDZ2 250w 36v motor with VLCD5 Display and Throtle.
Everything works well.

I bought a 500C display with new cable and Throttle, but i have 2 Issues :
1/ Activate taillight on Display don't activate the light, was Ok on VLCD5 display
2/ When using Throttle, i have a speed limitation at 20km/h, was no limitation with VLCD5.
Tryed to change speed limit in the 500c display with no effect

Speed indication and setting wheel size seems to work

Have you some recomendation ? Have you test the 500c Display ?

Thanks