my son is trying to install a new stereo in his 91 supra and the pioneer stereo he bought fits the factory opening perfect but I have having a hard time finding a harness to install it? he got one from Walmart that says it will fit but the plug only has 10 pins while his factory stereo has 14 pins? I stopped by a stereo shop today and they said no one makes one for a 91 and it has to be hard wired in? if this is true does anyone have the color codes for the factory plug? Thanks for any help.