Drivetrain PTO speed sensor engineered for accurate RPM readings on Case IH tractors. Direct cross-reference: B37121, 220119A1, 636/220119A1, and 60702082.Equipment Fitment:Case IH Tractors: C80, C90, MX80C, MX90C, MX100, MX100C, MX110, MX120, MX135.