**installing a Screen in my maxima**

[racebuilt]

hey guys i need a answer. so im installing a screen my self and i read some where that i need to connect one of my wires to my speed sensor wire and the color it PINK with BLUE stripe, and i think i found it but its behind the gas gauge and when i read it, it said it would be located some where else. and i cant find anything where to de code the wires so thats why im asking you guys...and i need to connect these wires for the GPS on the screen...

so has anybody installed a screen them selfs??