Okay I have a tach I would like to install, the tach has, RPMs, oil pressure, oil temp, water temp, and a shift light. I have all wires I think, so if anyone can tell me what goes where or has a diagram would be much appreciated, thanks guys!
Try Google using the tach name, model number, and manufacturer and see what you get.
Most of the reputable manufacturers have websites with installation and instruction manuals for the products they make.