I found this image pinout but it not working for me I need to know the pin out of this display
you are supposed to multiplex this display. Put a current limiting resistor between pins 10, 8 and 6 and the arduino and all the rest can be connected directly.
First pull pin 10 low and use pins 7,9,2,3,4,1 and 5 to set the segments of the first digit.
Then put 10 high and 8 low and again use pins 7,9,2,3,4,1 and 5 to set the segments of the second digit.
repeat with pin 6 pulled low.
You can test the display with a battery and resistor. Connect them in series and put positive on the lower left pin and negative on the upper left pin. That should light up the top left vertical segment on the left most digit. You may need to turn the display around.