Making Vintage Porsche Gauges Work with Modern EFI (PWM Calibration Explained)
Автор: Garage Time - DIY Porsche Restoration
Загружено: 2026-02-28
Просмотров: 366
Описание:
In this episode of Garage Time, I show how I calibrated my classic VDO oil pressure and temperature gauges using the ECU’s PWM output on my EFI Porsche 911 hot rod.
Since switching to a modern standalone ECU and a Siltec combo oil pressure/temperature sensor, I deleted the original resistance-based sending unit. Instead of installing new aftermarket gauges, I’m using the ECU to drive the factory VDO gauges using pulse width modulation (PWM).
In this video we cover:
• How PWM controls a resistance-style VDO gauge
• Why 100 Hz works better than 20–30 Hz
• How duty cycle affects gauge sweep
• Filtering the signal so the needle doesn’t bounce
• Programming the factory “idiot light” as a multi-function warning light
This setup blends classic Porsche looks with modern EFI functionality — and adds engine protection strategies like oil pressure shutdown or limp mode.
Modern control. Vintage feel.
Car: 1974 Porsche 911 Backdate
EFI: Individual throttle bodies (Kinsler)
ECU: EMtron
Sensor: Syltech oil pressure & temperature combo
#Porsche911 #EFI #VDO #ECUTuning #HotRod911 #PulseWidthModulation
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