motor at low idle about 800-900 rpm....... speedometer reading 1600-2000 this problems happens sometimes dont know whats causing this too happen. when accelerated rpm seems too be behind on reading the actual rpm it sometimes jumps up and jumps down. sometimes when i start car the rpm is reading accurate at 900 rpm.

 

is this your OEM cluster or did you install this?

 

installed the cluster 1 yr ago been working fine since then. till now.

 

any sensors?