bit of a strange 1,

i recently snapped my cam in half long story available in my resto thread

ive fitted a new head that was from my mate tom scarletts 300bhp s1, now the head was all built up when i put it on, head,valves,lifters,rockers etc along with a vernier pulley,

the pully was not bolted to the cam tho,

now ive fitted it all up and the car runs fine but im getting an oil leak from the end of the cam itself where the vernier bolts on it is not coming form the rubber seal around the cam as there is no oil whatsoever there, its driving me mad as its making a right mess flicking oil all over the show,

here is pics of the vernier,sensor set up all bolted on then a pic with the sensor pick up and bolt removed to show the oil seeping out







is there meant to be an o ring or something there or is the reason its leaking oil because i have not thread locked/sealed it as i wasn't sure if the sensor was in the right place? if was to seal it with thread sealer would this stop it ok

thanks