K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
4.
Remove and discard the indicator ring (factory use only) from the male fitting.
5.
Install a NEW retainer fitting into the female fitting.
6.
Connect the fittings together until a snap is heard and/or felt signifying the retainer tabs have engaged the raised feature of the male fitting.