OK I'm the guy with the taurus that will not run right. Everyone is asking me is the check engine light on? Well i don't see on on the Dash. I have the digital dash and there is a service light below the TACH it only comes on upon start then goes out immediately. Well i investigated and for that the tan red at the diagnose plug has an out put there to turn on a check engine light and hooked up a test light too 12v and other end in the tan red port. well when i start the car the test light turns on and stays on till it is running if i leave the key on without starting it stays on while the service light goes out. WELL now i know they are different what is the SERVICE light for? Also does anyone know if I'm supposed to have a light on the dash for the check engine? any one have a digital dash 1st gen taurus that knows this?