Comment by queenkjuul

Most games won't work right if you force 1080i (which you can do using OPL) but the light gun will work with component signals just use the green plug as has been mentioned.

Gran Turismo 4 will output 1080i correctly, I've done that before, but the internal horizonal resolution is very low, so i actually prefer to play in 480p on my LCD, ymmv

There's Pelican brand wireless light guns NOS on eBay that work with both PS1 and PS2 games that I've so far had good luck with