Boost Gauge not Showing Negative (Vacuum) Pressure In BeamNG Drive.

I am using a Nissan GTR addon +-boost gauge which has been configured correctly and works great in beamng drive ver 0.34 using SHTelemetery Mod, The positive value side works Perfectly but when a turbocharged vehicle shows vacuum due to turbo lag (e.g -0.2bar in game) the needle doesn't move to indicate the negative pressure and stays at zero. Simhub can see the negative value but somehow this doesn't cause any gauge movement at all. It just stays at center point Zero. The minimum gauge value is -1bar @0PWM . The max is also 1bar @240PWM. The Zero Center Point is 128 PWM. The test MIN, ZERO & MAX Signals do work perfectly. I dont have another supported game to test if its a Simhub Issue or something else. 🤔