Which part MUST be used when refitting a vehicle from R-12 to R-134a refrigerant?

Question

Quizplus · Accepted Answer

Both a high pressure cutoff switch and a new service fitting with a retrofit label are essential when refitting a vehicle from R-12 to R-134a refrigerant. The high pressure cutoff switch is necessary to accommodate the different operating pressures of R-134a, and the new service fitting and retrofit label ensure proper identification and servicing of the system post-conversion.

Which Part MUST Be Used When Refitting a Vehicle from R-12