It does make a necessary difference, but you'll also need this set of +clight files I created that match the rest of the Stirling gauges.
This zip also includes the B Gauge MKV .+clight.dds provided with the original package as well as a uv/radium version of the WELLsite.+nlight for those who are using the alternate TOW_Manchesterxxx bomb sights.
Since WELLsite is an nlight, instead of a clight file, the UV lights should be off when viewing the bombsight (F7), or you'll see the default red cockpit light instead of green.