stores.ebay.com/GLOBAL-AUTOMOTIVE - How to properly diagnose & test the fuel level sensor on a GM vehicle. Most GM vehicle have a factory spec resistance of 40 Ω empty & 250 Ω full. If you are having trouble figuring out the factory spec resistance for your vehicle, then please contact us via email - globalautomotivemiami@yahoo.com or telephone - 305-232-3433. Thanks