I have moved your discussion to the "Hudson" category. You had posted it under the category for comments on the operation of the Club or Forum.

There is a device call "Gauge Wizard" that allows you to use and sender with any gauge. you can calculate them to work together. The same device works for fuel gauges/senders. If you google it, there is you tube video showing how to program and wire it up.

I know the Echlin ECH TS6464 fits my 1951, but the 1948-50 sender has a different thread and apparently is incompatible per a Hudson Technical Service Bulletin:

CYLINDER HEAD TEMPERATURE INDICATOR ELEMENTS

When installing a 1951-54 type engine, 6 cyl. or an 8 cyl. Head or engine in a 1948-50 car,
the cylinder head must be modified to accommodate the car's original equipment type
temperature indicator element.

Redesigned gauges were used starting with the 1951 models, which operate on a constant
potential of 5 volts and require a different cylinder head element from that used on previous
models. The newer element is 1/4" pipe thread diameter and is shorter than the 3/8" pipe part used
on the earlier models, which necessitates drilling and tapping the new cylinder head. If the proper
cylinder head element is not used, incorrect gauge readings will result.

To install the original element in the now cylinder head, the hole in the left side of the head
must be enlarged from 1/4" pipe diameter to 3/8" pipe size by drilling out the opening with a
37/64" drill and re-tapping with a 3/8" pipe tap. On six cylinder engines the location of this
element is changed from the front of the head to the rear, which will require shortening the wire
slightly to correspond.

This doesn't give you the correct part, but at least it discusses why the 1951-54 temp sender won't work.

Good luck,

Chris

I have one if you need one. 704 792 911 zero

I had the same problem with my 1954 Lincoln Capri. I removed the sender and cleaned off the oxidation with a dish scrubby pad. Now it works like new.