Dear friends, i got a used navman. Wind 3100 with a masthead instrument, without cable, the wires coming out of the screen are cut short 10in long one have 5 thin wires red green brown white and naked, the second have 7 thin wires, black red orange white blue green and yellow. The screen works good, i connected the red and the black to 12 v and it works, any help how the connect the mast head instrument ? The masthead instrument have yellow blue red black and white. I appreciate your inpute. Thank you