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The following are similar, so it's a matter of experimentation and to see which ones are most useful to you. I use % engine load or MAP for acceleration, and instantaneous mpg or (maybe) an o2 sensor for coasting. I personally didn't care for the throttle position sensor, perhaps as the pedal doesn't attenuate very well.
% engine load
MAP
absolute throttle position
o2 sensor
instantaneous mpg
Definitely calibrate the gauge to work with the various sensors in your car.
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