P3 Analog Boost Gauge - BMW G20 G21 G22 G23 G26 (G2X) 2019+ | 3 Series & 4 Series | True Boost/Vacuum Sensor, 0-5V Inputs, Battery Voltage

P3 vent-mounted performance display for BMW G-series 3 and 4 2019 onwards

Looking for a stealth turbo pressure monitor for your G20, G21, G22, G23 or G26? This P3 vent display gives real-time manifold pressure and vacuum using a dedicated analogue transducer, plus two auxiliary 0 to 5 V channels for add-on sensors and a built-in voltmeter for live vehicle voltage. It is the tidy, OEM-plus way to keep an eye on critical data on any tuned or stock G-chassis 3 Series or 4 Series.

We run this setup on customer cars and our own builds. It looks factory, reacts instantly and has been rock-solid reliable. Owners love the clean install, clear readout and the flexibility to expand with extra sensors as their project evolves.

What it measures

• Manifold pressure and vacuum via a dedicated analogue sensor for true, stable readings direct from the intake
• Two auxiliary 0 to 5 V inputs to display external sensor outputs
• Live system voltage right on the screen

Popular 0 to 5 V sensor uses

• Oil pressure sender output
• Fuel pressure sender output
• Ethanol content analyser output
• Intake air temperature probe output
• Exhaust gas temperature amplifier output
• Wideband AFR controller output

Why enthusiasts choose this vent display

• Discreet, factory-style integration for a clean cockpit
• Dedicated analogue pressure sensor for accurate boost and vacuum tracking under load
• Two flexible aux channels to grow with your mapping and hardware upgrades
• Optional auto-dim input for comfortable night driving

Wiring overview

• Boost sensor: yellow, purple, black
• Aux input 1: brown wire accepts 0 to 5 V linear signals
• Aux input 2: blue wire accepts 0 to 5 V linear signals
• Voltage display: red and black for power and ground
• Auto-dim trigger: green wire to a lighting-live circuit, then enable in the menu

What is included

• Integrated vent display
• Analogue Box control unit
• Main harness
• Hard-wire harness
• Analogue pressure sensor for boost and vacuum readings
• Approximately 5 ft of 5/32 inch O.D. boost tubing with 5/32 inch I.D. hose at each end
• 3 zip ties
• 2 scotchlok wire taps

Fitment and install notes

This is not a plug-in OBD gauge. A physical boost or vacuum line to the intake manifold is required, along with power, ground and any optional aux sensor wiring. A boost tap is not included. Professional installation is recommended.

Want us to handle the fitting? MJ Modifications offers in-house installation in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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