can I find some info on a wiring harness for a 90 model Merc. The controls on the Astro are for a 90 model motor but my motor is an 82. Not many differences tho, temp gauge and the trim being the only two that I can find. Temp gauge really not an issue as I have a water pressure gauge but the trim units are completely different as far as hook up. The 90 model was self-contained and the 82 has an external pump. I need to know where to find the three wires and their color codes to attach them to the external pump. Thanks guys.