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If all this not help please test same Stepper Motor for a different gauge.... Maby a Standard FSX Value like Flaps or the Gear Offset. Just for testing if Motor is working fine
Please Report if problem is solved !
6C24 4 FLT32 AIR_CabinAltNeedle ft
6C28 4 FLT32 AIR_CabinDPNeedle PSI
6C2C 4 FLT32 AIR_CabinVSNeedle Ft/min