Where can a person buy the terminals that fit the round connector that plus into the back of the gauge cluster?

would help to know what car/cluster... however they use to be molex terminals

'69 b body - non rally cluster. The ones in the main round connector.

Molex .093 fit the pins good. Not sure if they will lock into the housing. I can check today.
https://www.twistywristarcade.com/093-connectors/325-terminal-093-female-14-20awg-tin.html

Yes, looks like they will work.

AWESOME !! Thanks. Even managed to find them in Canada !!

If you really want to make them tight tight, put them in a vice and squeeze them just a little. Make them oval. If you look at the factory female plugs, they are a little ovaled. I could not believe that a new harness from H&S did not have these on. I had to find them locally and replace the "female connectors" they had on. Pretty lame for a $500 part.

i too, have used the .093 molex connectors. those, and the .125 connectors are also used in the column to main harness connectors.
there is also a dedicated molex terminal crimper, but if one takes care, the crimp can be done using a weatherpak crimper.
buy quality connectors with a few extras to practice with. whatever you do, DON'T buy one of those eleventybillion piece kits that include the crimping pliers, from those import stores that are made of CHINESIUM. !

Yes. A quality crimping tool is a must!