I have been studying The OX and experimenting with sound trying to emulate him for over 35 years now. I have a Fenderbird, an Explorerbird, Alembic, a couple of different Precisions and I even built a 66 slab to try to cop his various tones. I also impersonate him in a Who tribute band. I've gone through many thousands of dollars throughout all those years in my quest. His tone after 1985 never impressed me as much as all his prior years.
His sound really is all in his hands. Contrary to believe, he DID NOT have a light touch and his set up has a lot to do with his tone. My best advice is to find a good Fender Precision with a maple neck. Set the string action to just a hair above the frets to the point where they start to buzz. Rotosound does not make strings as good as they used to anymore so try a set of Ken Smith Burners 45 to 105 , you will be pleasantly surprised. A good amp ( Ampeg, Ashdown, TRace Elliot, ect) with a boost such as a Sans Amp DI or the new Ampeg sci di will just about hit the spot.
3 1/4 bass, full treble, mids anywhere between 4 and 6 on BOTH the amp and the box and volume as loud as you can stand. Play the notes as if you were tapping a drum with your fingers, in between all of this watch all the live segments of the Kids are Alright film daily.
The amp, bass, set up and box configuration should cover a similar tone up until the Quadrophenia album, after that you will need a Tbird but this configuration will get you in the ballpark all of the OX tone for a while.