[Charlie Cheap]

I posted a similar thread somewhere but it probably was in the wrong place. We had a 1975 Pinto V6 that had an economy light on the dash. I am sure it was a simple vacuum gauge that was adapted to the light for ease of reading. As the vacuum dropped the light got brighter or dimmer...I forget which, but it told the driver if the throttle was being pushed too far for best MPG. It was a great idea one could adapt to any carburetor fed engine. The gauge works but one must watch the needle while with a light, IT GETS YOUR attention.