Having the coolant temp labeled as “water out” with WinDyn is just probably left over from pre-WinDyn days, when it was absolutely referring to coolant temp.

When we changed the system here from the MS-DOS format to WinDyn, there are already preconfigured pages and screens you can use if you like.
The headings on the temperatures and pressures page used the same terminology as the old DOS format....... so “WatOut” for engine coolant temp.

I rearranged the channel order to something we liked better, and never bothered to rename that column.
I see some guys with newer systems are calling it something like “CoolOu”....... which is probably the default terminology from SF now.