GPSSPD and GPSHDG will work for those guages, but you would need an autoit script to store the speed and heading one second ago to compare to now and display a new variable, which you can put into flash as dynamic text with that variable.
here's some inspiration pics:

(the left right and brake/gas part)

(bottom left corner)

Maybe like this, but flipped so that left is on the right side, and accel is on the bottom. That way when you turn left, the pointer moves to the right (like all the stuff in your trunk) and if you brake hard the pointer goes to the top (again, like the stuff in your trunk...) if you are accelerating AND turning, the pointer will not be on the line.
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