Temp sensor question

Good Day All and Happy New Year.
Installing a late 70's /6 with the 'peanut plug' head into a '67 Dart. The later head is tapped for a 3/8 pipe temp sender.
The '67 sending unit is 1/8 pipe sender. Any suggestions on a 3/8 sender that would be compatible for a '67gauge? I would prefer not to use a pipe adapter.
Use to have an older Echlin Buyers Guide that gave all the specs for these things, but it apparently went away.
Thanks to all who respond.
'64 Dart