The internal resting peg for the speedo is painted, and in hot weather, the paint can get sticky and then the needle will stick on the peg initially. The solution is to remove the cluster and clean the paint off of the peg. There is probably nothing more than this wrong with the cluster, so try that first before replacing it.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record