How To Install A AfterMarket Tach
Installing a aftermarket Tach is very easy.  You can pick up these tachs at Walmart for 32.00 but they are 2 1/2 inches without a shift light.  If you want a shift light Canadain Tire, or any preformance shop will have tahcs

Step 1: Read over the instruction (if they have them) and make sure you have all the parts, bolts screws, wire crimps ect

Step 2: Decide where you want to mount the tach. I mounted mine under the cigarette lighter right of the ashtray.  From there I find I can get the best view of it. 

Step 3: Wiring it up.  the GREEN wire goes to the "TACH TEST" on the coil.  A wire crimp can be used here to connect the 2 wires together.  The RED wire is your power source.  This can be any live wire.  Since my truck has FOG LIGHTS installed on it, I decided to use my fog lights as the live wire.  The BLACK WIRE is the ground.  Any piece of steel or a screw will work.  When the FOG lights are on, the Tach will be illuminated.  They suggest istalling the tach to your headlight switch but since I didnt want to rip the headlight harness apart I used my Fog lights instead. Way easier

And thats it. Simple eh?