I couldnt find a good write up on how to install an aftermarket tach so I decided to make one to help out others who want to do this
10mm and 12mm socket with ratchet
Disconnect your ground wire to the battery with your 12mm socket!
WRAP EACH SOLDER CONNECTION AND CUT END OF EACH WIRE IN ELECTRICAL TAPE.
Mount your tach wherever you want. I used these velcro strips from target that were 3 dollars because i didnt want to drill into my dash.
We need to pull out the instrument cluster to do this, so first we are gonna need to take off the trim piece surrounding the a/c controls and radio.
Start by removing the knobs from the climate control. They pull right off.
Next take your flathead and pop it out.
There are 2 screws holding it into the dash. This is the one on the right, and then you need to remove the one on the left. There are little clips holding it in after you remove the screws. They will come right out with a little effort with a flathead and disconnect the hazards switch.
Next your gonna remove the piece under the steering wheel. It has 4 bolts holding it in. 2 on the left, 2 on the right. I had already taken it off, but you get the point
Pry out the piece around the ignition, it has 2 clips holding it.
Now remove the trim around the cluster. Remove the screws holding it in. I didnt get a picture of all of them but dont forget these 2..
And you know the drill... pop it out with the flathead. The drivers a/c vent kind of gave me a problem but it came out after some tugging.
Then we can finally remove the instrument cluster. Remove the 4 screws around it.
Unplug all the harnesses hooking up to the cluster. It will come right out after you remove the screws and harnesses. Disregard the green wire in this picture, my tach was already installed but i used wire nuts instead of solder.
This is where your going to connect the green wire on your tach. Use the PLAIN black wire going to the blue harness. Cut it, strip it, and solder the 2 cut ends and the green wire from the tach together.
Now we need to connect the tach to a power source. I used the clock harness for this. Some tachs may draw too much power for this to work but mine is only a 3 inch backlit with no shift light. So its fine for me.
Unplug the harness from the clock, this is what it looks like.
Cut and strip the grey/red wire on the clock harness. This is what you will solder the positive wire from the tach to.
Cut and strip the yellow/black wire on the harness. The negative wire from the tach solders onto this one.
And the last one.. cut/strip the green/red wire on the harness. Your illumination wire from the tach will solder onto this one. On my tach it was the white wire, pretty sure its the same for all of them.
I took all my wires and used zipties to coil them all together like a hose so they werent all over the place. You could drill holes behind the tach to run the wires thru but i didnt want to ruin the dash.
Put the cluster back in, and hook up all the harnesses again. It was a little diffucult to get them all hooked back up but its not impossible. Before putting everything back together check that its all working still. Make sure your tach is plugged in. Reconnect the ground wire on the battery. Start it up and check if its working. Make sure your tach is set for the correct number of cylinders. You can search for the manual on google if you dont have it to find out how to change the cylinder setting.
If its not working, check all your connections and make sure theyre secure. While putting everything back together, make sure to plug everything back in.. for example the clutch start cancel, the dimmer knob, your hazards switch, etc.
And heres your finished product:
If you have any questions pm me!