Dash harness meltdown help

if you have the schematic's for both harnesses. what matters is where the wires are going, how they mate up and not the color. example - if the fuel gauge wire is black in one and blue in the other what matters is where the wires go. I think you will find many of the wires may be the same or similar color. How they route is different. Don't over think it the wiring itself is pretty basic.

The switch is a push button switch from the center. if it fits I am sure you can make it work. The wipers are one component of a wiring harness and look at the project as such.