Installing a tachometer is very simple. It consists ot 2 simple steps: mounting and wiring. Both can be very tricky if you're unsure about what you're doing. These instructions are for any 90-93 Toyota Celica. Other Toyota vehicles may be similar.
Tools needed:
- Screwdriver (standard and Philips)
- Wire cutter
- Razor blade
- Drill
- Drill bits
Materials needed:
- 2 #8-32 x 1" bolts
- 2 #8-32 wing nuts
Step 1: Mounting
I didn't mount my tachometer on the left side because there is a vent I would end up drilling through. Instead, I mounted my tachometer in the center of the car to the right of the driver. The mounting instructions are for those who wish to mount their tachometer in the center of the car.
Pull out the center vent. Unplug the clock and the hazard plugs. You will be drilling three holes: 2 for the mounting screws and one for the wiring. Simply drill 2 holes large enough for the bolts to fit through and one hole large enough for 4 wires to fit through. You'll have to drill at an angle since the windshield is in the way. Mount the tachometer to your liking.
Step 2: Wiring
On the back of the tachometer, there are 6 wires: green, red, black, white, brown, and orange. Clip the brown and orange wires. Look at the back of the clock plug; there are 4 wires. You only need to be concerned about the gray, green, and white/black wire. Splice into each wire as follows:
Power: red on tach --> gray on clock plug
Ground: black on tach --> white/black on plug
Illumination: white on tach --> green on plug
Tach wire: green on tach --> black wire ON IGNITER
Under the dash, above the steering column, there is a brass-colored fitting that hides a hole in the firewall. Simply route the green tach wire through the hole and into the engine bay. If you have an aftermarket electronic ignition, such as MSD, GM, HEI, or Crane, connect the tach wire to the tach terminal.
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