Could someone help me out!

i bought an "Ultra" Speed Meter, and it didn't have instructions on how to install it.

i've websearched, and can't find anything written in English, only Japanese...

Is there anyone here who knows the gadget i am talking of, with any insight on what wires get connected where?

5 wires
black: earth
Red: ignition Power
Purple: No idea
Orange: No idea
Green: No idea

this gadget measures speed, 0-400m times, and also acts as a trip meter.

Anyone?