Speedo sticking

Hello folks first time on this forum .Have a k12 04 plate 1.2 i am doing up for my daughters first car . The speedo sticks in places , reads 10 mph at standstill and doesnt appear to read correctly . No defects shown on obd scan . Suspect instrument cluster pn ax870
1 can any similar k12 cluster be fitted or must it be an ax870 ?
2 will there be any issues after fitment ie software/config
Only a cheap car for her first vehicle so not wishing to spend a large amount of money but she loves driving it .
 
Phoned nissan to check if any problems with replacing cluster ie software / config nissan says NO PROBLEMS
replaced cluster for £30 now nats security light shows on dash ( believe part coded ) but still drives.
Contacted nissan to discuss about thier advice but told we can look at it but it will cost £90 plus
 
Took cover off , needles easy to move no resistance compared to revs . Sent speedo to cartronic cost £111 retuned within 2 days , refitted cluster now no red light ! Moral of story - dont trust my local nissan garage cost me £40 and now have a spare cluster
 
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