Suggestion I used...
On my 09 FLHR, Taking a Small clamp-plier that I have. Adjusted Open enough but will Lock on-to the oil sender... Carefully going at it from the front above the pipe and or a little below it 15* or so..... Straight in,,, not at 90* worked to loosen mine then Resealed to put back on... I used a small crescent wrench to turn the clamp plier. then reset the plier for another Small turn.. Takes a little time but worked for me.
I used this Removal method when installing a HD side-head mount oil gauge... I re-installed the sender on the adaptor fitting when out. Then used the Very small crescent to tighten 90* on fitting again..... or You will have to use the small clamp pliers.
Careful Not to Over Tighten as you can damage the pressure sensor OR Crack the engine case......
signed....BUBBIE