I'm new and not sure if I'm even posting at the right place but here goes anyway... I have a 1988 Power Ram 50, it's a 4 cyl., 4x4, 2.6L.. It does not have a tachometer from factory but some models do.. I have been beating my brains out through the Haynes book and the net and can't find anything.. I have a shift light I was looking to put in but can not find any schematics or what wire I need to tap into.. The light runs of a RPM pill or module.. I can not find the negative on the coil to run off of either.. The coil is a diamond f100 or another number would be md102315.. If anybody could point me to schematics or the wire I need to find I'd greatly appreciate it.. Thanks in advance..