Fixed...
Inside the sender is an 82 ohm resistor, it has corroded away due to leakage thru the external top seal.
I didnt know the value so I just rigged up an old rheostat across leads until all fault lights behaved as they should then measured with an ohm meter.
Went to the shop, purchased a few resistors, 82 ohm, and a couple of 10s to trim if needed.
Jury rigged the 82.... perfect.
Hardest part was opening the sensor, the top O ring was stuck in place.
Just put a smear of silicone adhesive around it on replacement and a spray of conformal coating over the new resistor etc before assy.
Works like a new one in. Costs $105 dollars here. Best 1 hour and 12cents Ive spent in a while
Last shot shows where these washer containers normally . I sealed mine up up when I got it
Bazzle