1988 Dodge Ram 50

I have an 88 Ram 50.. 4 cyl. 2.6L 4x4 5 spd.. I was wondering if anyone could point me in the direction of how to hook up a shift light.. I tried to the coil and it will not work.. I am mainly looking for the hook up from the ecu to tap into or under the hood elsewhere.. Any tips would be greatly appreciated.. Thanks in advance.. Dusty