Pressure switch replacement kit for Jaguar cars fitted with the JLM 1260  pressure switch which is fitted in the rear of the sanden compressor with the single V belt pulley ( not the big long black Harrison compressor or the multi rib pulley sanden on 94-96 model year cars) also your condenser inlet pipe fitting has to be UNF threads not metric ( metric is defined by having cuts in the nut faces) . 
If your switch is burnt out you can simply fit our switch in-between the condenser and discharge pipe ( degas the system first) and remove the switch wires from the original switch and connect to our switch. 
where your switch is leaking, then remove the original switch from the compressor, fit the machined blanking plug supplied and connect the new switch wires to the original