PS2 light gun games on sony wega tv

[grok]

Hello,
I have a sony wega 40" tv and I tried unsuccessfully to get a light gun to work with house of the dead2 on a dreamcast. The gun, however, would work on other tv's. I am a big fun of light gun games, and was wondering if anyone had trouble or some pointers on using a lightgun with the PS2 and a Sony Wega TV.

I'm in the US, so please let me know your experience, but also specify if you have NTSC/Pal (overseas for me).
Thanks for the help.