Hello!  I have a 1959 Galaxie with a 292 and am having a hard time locating a replacement temperature sender.  All the major parts sources I've checked list a unit that is small enough to fit inside the threads of the unit installed in my motor.  My temperature gauge reads high when cold and low when warm.  Has anyone else dealt with this issue?  I have been surprised not to have found mention of it on the internet to date.  Thank you!

1954 Crestline Victoria 312 4-bbl, 3-speed overdrive