oil pressure switch - plug part no.

[scalino65]

Hi. I am getting my oil pressure light flicking on and off and I think its down to the plug that clips onto the green switch itself. the light will go off if I give the plug a little jiggle. I've tried all sorts to try and make the plug snug on the switch but its still not a really tight fit. I want to now try and replace the plug itself but I cant find a part number,etc. Does anyone happen to know the number or where I can get one? Many thanks. Will