740 Cluster change mph to km won't read past 80kmh

I changed my cluster from one that reads inmiles per hour to one that reads in kmh now it won't read past 80kmh on the kmh cluster. Help!!!


Also my car has a breaking up issue past 4k rpm in higher gear or on hard pulls. Like spark cut out as it sort of backfires like it has some sort of anti lag setup

We need more info here...

Don’t know about the driveability issue, but I had this issue in mine when I replaced the speedometer gear. Apparently some broken pieces were binding up the mechanism. Might try using canned air or shaking it or trying to turn the magnetic wheel be hand.