The reason the mechanical gauges are more acurate is they have a full sweep as opposed to the electrical gauges haveing a 90 degree sweep. Same range, but mechanical have further travel. Which also makes easier to read and be more precised.
For fuel I would get the isolator. Most tracks will not allow fuel in the inside of the vehicle.
2010 Shelby GT500, Kona Blue W silver stripes.
2007 Shelby GT500, Vista Blue with Tungston gray stripes, 1 of 119, Wifes car...
94 Cobra Pace car Convertible # 591
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2001 Cobra vert # 2001 SOLD