Backcourse Gauge

Hi All, I'm trying to build a visual Backcourse gauge that appears inside my EADI gauge. Here is how it is suppose to work:The Backcourse will indicate that you are more than ninety degrees from the localiser and no glideslope will be available, and you can still capture the back course beam.This is what I have, but the visual B/C doesn't show when I am more than 90 degreees from the LOC.(A:HSI GSI needle valid, bool) 0 == (A:HSI has localizer, bool) (A:NAV1 localizer, degrees) 90 > &&B/CAny Help will be greatly appreciated.Thanks,Benny