I can help you on that 1. Your tacho has at leas 4 wires or 6 if you have a shift light
you will also have a switch to set mode for 4, 6 or 8 cyl engines or it may have 3 looped wires again representing 4, 6 or 8 cyl, which have to be cut accordingly.... The red goes to a positive on the Ignition circuit (so it works only when the reds are on or when the engine is running) the black wire goes to earth generally under a screw that goes into metal. The white wire goes to your Instrument illumination circuit so when you turn your lights on the tacho is illuminated and the green wire goes to a wire that is located in the engine bay on the passenger side usually around the strut tower if you follow the wiring harness from the firewall to the passenger headlight you should find it poking with a small rectangle plug on it I cant remember but i think it is brown. Its pretty easy to do, I wired mine in to my fuse box below the steering wheel all the fuses are clearly marked as to what they protect and and weather they are on the Battery, Accessory or Ignition circuits... good luck and be careful where you mount it, I'm not 100% sure but I don't think you can have it any higher than your steering wheel