slight oil leak?

hey all im racking my brains but cant find a answer could anyone help i serviced the k10 last month, i found a oil leak on the back of the block looks to be coming from around a oil sensor would it be the o ring round the fitting that has perished or something else? let me know your ideas people thanks alot .

skrib.
 
I know on the old fords, they always seem to leak from the oil pressure switch. Mines been replaced god knows how many times.

If it's deffinately the switch leaking itself, I'd just replace it, I think the ford ones are about £5 from a motor spares place. So i'd hazard a guess the nissan ones would be there abouts too.
 
Garantee it the oil pressure switch happened to my st,take it out wrap a bit of plumbers tape (PTFE) around the threads and wack her back in mines done 10k kms and no leaks
 
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