I have wg7202 monitor and I also had an old WG 46xx something. I don't remember exactly what happened when I connected the NEW one thinking it would just be a swap and it goes, I was wrong. I found out after lots of fidling that the NEW one's V-Sync/H-Sync must be separated. In my older setup, this wires was twisted to get composite connection and I'm assuming that this would be your case.