I installed the VDO combination oil pressure sensor and low pressure switch. I originally ordered an M10x1 thread pitch sensor but the VDO sensor has an M10 tapered thread where the port in the Audi engine has straight threads for use with a crush water. For example I could use an M10 banjo bolt and line if I need a pressurized oil source off the engine. Instead I ordered an adapter from an M10 straight thread to 1/8 NPT and then ordered a VDO sensor in 1/8 NPT. The resistance range of the sensor is appropriate for my VDO oil pressure gauge. The sensor also has a low oil pressure switch that I will use to run a dash warning light. It seems unlikely that a low mileage engine with oil wouldn’t have good oil pressure but the gauge and light will give me piece of mind while I am tuning the fuel injection.

I installed a new fuel level sensor with the proper resistance range for my VDO fuel gauge. It was not quite plug and play as I had to take the large filler flange off the tank and install the sensor from inside the tank through the filler opening. I also had to very slightly enlarge the sensor hole as there was slight interference with the internal sensor bracket. The fuel level gauge works properly now.

I made holes in the exhaust system for the O2 sensors. The sensor bungs need to be welded in place and I need to run switched +12v power wires for each sensor. I loaded TunerStudio on my laptop and did the initial configuration of the MS3 Pro fuel injection ECU. The ECU is configured for mass airflow. It also controls the variable valve timing and variable length intake manifold. I’m running semi-sequential injection and wasted spark ignition as I don’t have a cam position sensor as part of the system. After the O2 sensors are wired into the system, I’ll go through process of checking each injector and coil to ensure they are wired and working properly. I also need to test the fuel system.