I fitted a set of Lockwoord white dials amd while i left them to dry my young sister decided to run around the house at 120MPH. She was very thoughtfull though, cause when she parked up again, she decided i needed some petrol, So she gave me a full tank! I got the speedo to read correct (Me thinks!) but i aint sure about the petrol, when should the yellow light come on (position of needle on dial) i cant really remember. Any ideas on how to make sure its reading right?