car remote circuit

I need to integrate a Fuel flow sensor mentioned here to the car dashboard system, so as to display the flow readings on the dashboard screen and/or to a seperate display screen when fuel passes through the sensor . I'm specifically using this device which has a Working Voltage: DC 5V~18V...

Hi I am trying to repair my cars remote control unit but no one can identify what the part is that I require. Its for a 2102 Subaru liberty in Australia. Its says on it 400h we think. any suggestions appreciated. This is a picture of the intact part on the remaining working remote unit. Thanks