I need to get the bike finished ASAP because the car is going to the body shop and I didn't opt for rental car coverage. 
Its the one on the thermostat housing assembly.  Thanks.

Bought this last year to replace mine as it was always showing super low;

https://www.ebay.com/itm/281791314343

Radiator & Cylinder Head Plug Water Sensor for Kawasaki 92066-1183, 92066-1118

I've bought 2 of those and it too almost a month to arrive each time.

i used a spare aftermarket automotive one i had laying around from a car gauge. see what the parts store has for aftermarket sending units.

Thanks everyone I went ahead and accepted the insurance money myself and am doing the bodywork so the rush is over.  I got the eBay version, will see what it does.