The Orion controllers can be tied into existing OEM circuits. There are a few rules around this to ensure that both systems operate correctly and is not damaged. It varies for the different products and sensors.

Controllers that share a sensor has to share a common earth connection. Differences in earth will have an effect on the sensors signal. So make sure you connect the Orion earth to the OEM earth.

Never connect the reference voltage of the Orion controller to any wire of the OEM sensor. Only the signal wire is connected. It may damage either controller. The sensor already has power or reference voltage from its own OEM controller. See the drawings below.

Isolate the Orion wires that are not used. They will have power on them and may short circuit damaging the Orion or harness.

If the OEM sensor is not screened it is best to tie in close to the sensor and use the Spitronics screened harness. It may reduce some interference from coils. Remember Orion inputs need to cater for all kinds of sensors and cannot cater for week signals with interference. If you still have interference, then you may add a 100uF and 100nF cap as filtering on their reference line. See drawings below on Orion Tap-in Sensor filtering. NB. Do make sure which line is signal and which is reference. Crank the engine and measure AC volts to ground of each point on the sensor. The one with the highest value will be the signal line. For speed sensor you may need to lift the wheels up to simulate pulses. It must detect speed at speeds from about 3 Km/H.

The blue Reference volts comes from the OEM controller and differs between car manufacturers. Some use earth as a reference, other 2.4 volt, 5 volts and even 12 volts. The isolating capacitor will block the DC volts from flowing and only let AC signal volts through. Orion reference its sensor to 5V. Note that Orion requires a minimum 1-volt peak to peak signal.

Below are the basic connections. Some cars may have a magnetic crank sensor in combination with a Hall speed sensor. Connect them accordingly. All the Orion P1 connectors has the same pattern for crank (Pin 12) and cam (Pin 11) input signal. Note that harness colours differ and should be verified on drawings or GP Priority charts.

Speed Sensor Wiring
RPM Sensor Wiring OT01_P1
RPM Sensor Wiring OT02_P1