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The Rad Gauge combines the affects of the air temperature,
altitude, and barometric pressure. The gauge is calibrated in
percentage points. Its main advantage is that it provides the
tuner with an indication of how much the air density percentage
points. Its main advantage is that it provides the tuner with an
indication of how much the air density changes. The RAD gauge
will help a tuner maintain the ideal fuel air mixture. Once the
tuner sets the carburetor tuning perfectly, he then sets the RAD
calibration screw so the RAD needle is 100%. When the air
density changes, the RAD gauge will show the relative percent of
change. The tuner can multiply the RAD gauge percentage by the
main jet size and determine the corrected main jet size for the
air density.
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