Peugeot 307 VAN - Please help with dash and BSI milage ?

[ChouLu]

Hello,
Please help.
I have dash SAGEM T5-1
and
BSI VALEO BSI J04-00 FRN 9651197680

Now, a need change milage.

I must change km only BSI, or both (BSI and dash) ?


somewhere I read that you just need to connect the voltage to the dash to clear the km from the dash

Thanks

[icogsm]

both BSI and dash !
b.r.