I've got an SG2, Bought it when i bought the Neon. that car had no digital "info center", no MPG readout, no External Temp read out, etc.
I Normally had the 4 gauges set to
intake air temp______Avg mpg/Total Fuel Cost (ie: taxi meter)
Speed/Water temp in winter____"instant" MPG(3sec update rate)
moved it over to the Sable, b/c the Factory Speedo doesn't have enough gradients for my tastes, esp at night, only markings @ 10mph visible, only numbered every 20.
so it currently has this setup:
Speed__________Avg MPG (Doesn't Sync up with in dash avg)
Water Temp____Instant MPG
interestingly, the SG2, Speedo, and my Tom Tom can't agree on a speed. if i set the cruise @ 70 by the SG2, the speedo says 71-72, and the gps says 69.
the Neon's speedo was about 3mph faster then the SG2 when i bought it, but the SG2 normally matched the gps
when i replaced the tires with the factory size, it generally matched up across the board.
Factory size 185/60-15, vs the 195/55-15's My Brother had on the car.