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Hey Chuck, if im not mistaken you are asking for the gauge within HPT to turn a certain color dependent on whether its lean or rich.
I opened my gauge layout and settings for my wideband and mine works as you say. If its rich it lights up green, and if it hits the lean threshold it turns the gauge a red color.
Inside the gauge range properties under the "Scales" tab you can see I have:
"Range Colors"
Level 1 - green,
Level 2 - yellow ,
Level 3 - red
Then if you click "Gauges Layout" there are also "Ranges".
Well I have my:
level 1 "start and End" at 0 - 1 (1 being 1.0 lambda)
Then I have my level 2 at 1.01 - 1.20
And finally level 3 at 1.21 - 2
When my wideband would go lean the face would light up and somewhat flicker a red color.
Heres some screenshots of my settings. Hopefully they may help. If not, sorry, just trying to help