[Spridgets] Temperature probe adapter

[derf247 at gmail.com (derf)]

They probably used an adapter to facilitate the use of an off the
shelf probe.  You can just drill and tap the head.
You'll have less corrosion with a brass part going into a cast iron
part than you would steel/iron or steel/Aluminum.
You probably want to get the probe bulb in the H2O without restricting
the flow too much.