P3 Analog Vent-Mounted Boost & Vacuum Gauge Display for VW Golf Mk4 / Golf IV 1J (1997–2004) – OEM+ Vent Pod, Manifold Pressure, Battery Volt Meter, 0–5V Aux Sensor Inputs – Fits GTI 1.8T 20VT & TDI Diesel Turbo

Vent‑integrated manifold pressure and auxiliary sensor display for Volkswagen Golf IV (1997–2004)

Give your Mk4 cockpit a clean, factory look with the P3 analogue vent display. This stealth, air‑vent mounted unit delivers precise manifold pressure and vacuum readings with crisp, easy‑to‑read digits, plus a built‑in volt readout and two 0 to 5V auxiliary channels for additional sensors. Perfect for 1.8 turbo petrol GTI and 1.9 TDI owners who want OEM+ styling without bulky pillar pods or stick‑on gauges.

We run this setup on our own cars at MJ Modifications and the feedback from customers is consistently excellent: fast response, tidy integration and dependable data when driving hard or daily. If you’re chasing a discreet vent pod solution for your Golf Mk4 that looks like it came from the factory, this is it.

Main functions

• Manifold pressure/vacuum monitoring — dedicated plug for the analogue pressure sensor (harness colours: yellow, purple, black). A suitable take‑off/boost tap is required and not included.
• Two auxiliary 0 to 5V channels — brown wire (Input 1) and blue wire (Input 2) accept linear outputs from devices such as oil pressure, fuel pressure, ethanol content or wideband controllers. Sensor and scaling/configuration required.
• Charging system readout — battery voltage via red power and black ground wires for quick health checks.
• Auto‑dim capability — green illumination wire can be tied to a headlamp‑only feed; enable in the menu for night‑time dimming.
• Factory‑style vent integration — stealth, OEM+ appearance that complements the Mk4 interior.

Vehicle suitability

Volkswagen Golf Mk4 (1997–2004) including GTI 1.8 turbo (20VT) and TDI diesel variants on the 1J platform.

Installation notes

This unit is not plug‑and‑play. A line to the intake manifold (boost/vacuum hose) is required, along with wiring for power, ground and any optional auxiliary inputs. A boost tap or manifold take‑off is not included. Professional installation recommended.

Why enthusiasts choose this vent display

• OEM+ look and feel — blends seamlessly into the factory vent location.
• Accurate, quick readings — ideal for tuned petrol turbo and diesel turbo cars.
• Expandable — two 0 to 5V inputs for extra sensor data on the same display.
• Proven on our own builds — customers praise reliability and clarity.

Professional fitting

Want it supplied and fitted in the UK? MJ Modifications in Warwickshire can help. Request a quote: info@mjmodifications.co.uk.

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