With poop solder like where the sensor goes into the banjo, I doubt it's 'made by Bosch'.
More like a 'ooops, the wire is too short and we just need to get the connection a smidge closer' homebrew creation.
I'd even go so far as to guess it's not oil, but a temp sensor to get the one on top of the head laid down at 90 degrees for whatever reason, but chasing any # on the sensor should determin what is was for.
Cobble~soldered sensor in a banjo fitting on a 91?
I really doubt it.
But if it is indeed real, I'd be incredibly ashamed tell anyone of it's exisitance on the car.
Well, at least until you were sure all the duct tape and bread ties were freshened up, then that sensor could be the highlight of the freak show
Why in the hell would they bother with something like that?
Certainly not for clearance at least.
Must be some engineer was trying to prove his worth or something to keep a job and that was the best he could come up within short order.
The sensors for the motonic are of a different thread pitch, yet they had a jillion engine blocks already drilled and tapped for l-jet type sensors, so this was the way they adapted the sensor change instead of having to rework all those blocks?
It's just bizzare that something like that would appear like that in that day and age.
(I though banjos went out of fashion when carburettors did)