No need to go back to the cab, open the loom approx where it runs over the axle and trace your sensor wiring back until you come to two yellow crimp/heatshrink style connectors cut a little back from these and join your new loom in, the new loom is actually a Wabco universal trailer loom with male plug one end and two spades the other, tough plastic/rubber ■■■■■■, sharp side cutters make life easier, start to finish 30 mins, make a nice job 60 minutes.
Make sure you use the nice crimp heatshrink connectors.
Also quite common the the two pins in the sensor plug to corrode due to water ingress.