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If this is a early vehicle then the speedo drive cable may have broken. If a 1990 and up then the VSS may be bad. It lives on top of the transmission and sends electrical signal to the speedo via the ECU.
It looks to me you need a new or remanufactured cluster but ... find a wiring diagram for that cluster and with a test light checks the + wires(sometimes there is more than one +) and the ground on the wiring diagram. You will need to remove the cluster itself for the backprobe wire's test at the cluster terminals.
this is in the speedometer unit itself. either purchase a known good part from an auto recycler or people still rebuild these. on these, they are individual little motors inside and they will probably just replace the speedo motor and reseal it. unfortunately you can not purchase these parts yourself.
Typically on a Yukon instrument cluster this is caused by failing stepper motors on the cluster's circuit board, it can be fixed though. Check out this page for more about Yukon speedometer problems and how to get it fixed - Yukon speedometer fix
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