After changing the water flange ??????

After changing the water flange on the side of the block i now have the oil pressure buzzer going off . I unpluged a wire from the sender but put it all back together could it be the wire has a fault and how hard is it to rewire.
Seems funny it only started after doing the flange which went well, no water leak
Neil

Sorted

do tell wat it was?

It was the wire for the sender which is near the oil filter

No more   with the noice and my stereo can be turned down  
Neil