D2 TD5 Split oil pressure sensor port

Recently had engine oil pressure light come on so I rapidly stopped & had car recovered. A new pressure sensor was fitted but the warning light stayed on so the car was stopped within 5 seconds. The pressure switch was removed & the engine turned over briefly - no oil came out of the port. Removal of the sump showed the oil pump sprocket bolt to be loose. This has been replaced with loctite; on starting the oil light went out in 2 seconds. However there was a considerable oil leak which has been traced to a split in the pressure sensor port. Advice required on repair please.

I would have thought replacing the oil cooler with one from a breakers might do it.

Thanks - I'll check that out.