LC-1 narrowband output trickery, wonky boost gauge

[87WhiteTurbo]

Just got my Supra! Have some questions, if you fellow Supra owners would be so kind.

Anyone using the narrowband output on their wideband to trick the ECU into running lean during closed loop by scaling the voltage? Like ECU sees 14.7:1, but you're running at 15.7:1 actual AFR? I know its been done on other cars, just curious if anyone is doing it with the Supra.

Also, is the stock boost gauge usually wonky? Mine only seems to work at all once I hit nearly full boost. The car has an HKS gauge in a pod that works fine, but the needle on the stocker only moves at all once I'm well into boost, and never shows vac.