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Wideband O2 AFR gauge on dashboard #4

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@Kingfrezz

AFR Gauge

Wideband O2 display added to DashboardPage:

  • WidebandGauge.qml — compact AFR/Lambda readout (green/yellow/red color-coded)
  • sensormanager.h/cpp — new Q_PROPERTYs: wboAFR, wboLambda, targetAFR, fuelCorrection
  • Parses UDP fields from sensor module
  • Shows fuel correction indicator bar
  • Need: wideband O2 sensor + piggyback hardware before this is live

Status: ✅ Code written, waiting on hardware.

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