I agree with you but until I moved the sensor the oil pressure fluctuated badly it has now settled down but still has fluctuations Direct mounting would be a lot easier and eliminate possible leaks
This is out of the dynon manual
Oil Pressure Sensor The EMS-D10 supports several oil pressure sensor installations. The Dynon-supplied sensor and the Rotax and Jabiru pre-installed sensors are the most common. DYNON-SUPPLIED OIL PRESSURE SENSOR First, mount the oil pressure sensor to a fixed location using an Adel clamp (see picture at lower right) or other secure method. The oil pressure sensor must not be installed directly to the engine due to potential vibration problems. Dynon Avionics’ sensor is supplied with a 1/8” NPT pipe thread fitting. An adapter might be necessary for some engines. Please see the manual supplied by the engine’s manufacturer. You must use appropriate pipe fitting adapters and ensure that the case of the sender has a connection to ground. This is critical for functionality. Crimp a standard #8 ring terminal onto the white/yellow wire from pin 6. Unscrew the stud cap from the threaded stud. Place the ring terminal on the stud and secure the cap down sandwiching the ring terminal. Due to vibration issues, never connect the sensor directly to the engine. If you use Teflon tape or other seal, ensure the sensor casing still maintains a good connection to ground. JABIRU AND ROTAX OIL PRESSURE If you are installing on a Jabiru or Rotax engine, your engine comes with a pre-installed oil pressure sensor. Prior to mid-2008, Rotax provided an oil pressure sensor with 2 tabs for electrical connection. In mid-2008, Rotax switched to a new type of oil pressure sensor (Rotax P/N 956413) with an integrated 2-wire cable. Connect this newer sensor according to the wiring diagram at right. Connect the red wire of the new sensor to EMS DB37 Pin 15 (12V). Connect the white wire of the new sensor to EMS DB37 Pin 6. Then, connect one end of a 200Ω resistor to pin 6, and the other end to ground. The Jabiru and both types of Rotax oil pressure sensors are compatible with the FlightDEKD180. Select the correct sensor type as described in the Oil Pressure Configuration section on page 5-9