ECCPP 25 Qty. GM Stepper Motors Speedometer Gauge for Instrument Gauge Cluster Dashboard 03 04 05 06 Yukon Envoy Tahoe Silverado Cavalier Impala Sierra Avalanche Monte Carlo 1 Set of 25 Qty. Stepper Motors. A direct replacement for the XC.168, X15.168 and X25.168 commonly found in 2001-2006 General Motors instrument clusters. The stepper motor is a patented stepping motor design, which has a 4 gears design construction in order to guarantee high efficiency, high position accuracy and a robust gear system. The unique gear shape design reduces friction and noise. A special material is used for each component to increase liability & safety.