Hello, I really need some help here. I have a 1981 300SDL everything on dashboard worked until after someone installed a radio. Now I have no dash lights, no oil pressure read, no fuel gage, no temp. I think the 15 pin plug wires are wrong. The problem is I only have 13 wires and the colors don't match any schematic. I was hoping someone here could help with pin placement. The 13 wires are:

green, blue/black, green/blue, double wire blue, blue/red, double wire Black/blue, white/blue, brown/red, brown/red/white, white/violet, double wire gray/blue, blue/white, and green/brown, There is no plain brown wire to put at pin #15 as most schematics call for. This is an early 1981 first registered in 1980, any suggestions?