Wow Lee....yours is fancier than mine. I have like half that many gauges...and only two needles...speedo and fuel.
I'm jealous.
Anyway, as for the green turn signal lenses....mine were oxidized and had this kind a whitish film (old plastic) on them. I used 1200 wet sand paper for a bit and then some rubbing compound to clean them up. They are shinier than when original...but no longer have that oxidized layer on them.