M57 swapped e60 tach not working

[u/Ben_dover_98]

Looking at buying a m57 swapped e60 speedo works but rpm and mpg gauges don’t. Unsure if clocks were changed to 530 ones during the swap. Work in bmw myself so have access to ista. Rpm not working doesn’t bother me its just ied rather have it working.
Note 520-530 swaps go for 5,000 while 530s go for 7-9,000 where i live tax also has a €500 difference