Rob,
Good to hear you are still around
I am not sure what type of threads your sensor has, but if it is a NPT thread, Home Depot has an assortment of plumbing goodies.
To plumb my intercooler water pump, I used some NPT tee's for 3/4" ID pipe. The tee's all screw in to a commom block so you could substitute one of the extensions with the water sensor, depending on the thread.
Lanner could always fab you something out of aluminum
Sandeep