Page 9 of the manual says guage pin 5 outputs a 0-5V value. You will also need to connect gauge pin 2 to ground on the arduino and may also need to connect the ground from the 12V supply feeding the guage.
Page 9 of the manual says guage pin 5 outputs a 0-5V value. You will also need to connect gauge pin 2 to ground on the arduino and may also need to connect the ground from the 12V supply feeding the guage.