Install tachometer on 3.4 camaro

There is no tach - rpm sensor . This information comes from the PCM - engine computer .
Tachometer
The tachometer is a 6,000 rpm tachometer. It has four terminals labeled "B" (12 to 14.5V), "S" (EDIS tach signal in), and two "G" (cylinder selection grounds). The top ground (G) terminal is open on a 4-cylinder engine vehicle, and is grounded on a 6-cylinder engine vehicle.

• The tachometer is inoperative

• Powertrain control module (PCM).
• Circuitry.
• Tachometer.
• Instrument cluster printed circuit.

• Go To Pinpoint Test F .

• Incorrect tachometer indication

• Circuitry.
• Instrument cluster printed circuit.
• Tachometer.

• Go To Pinpoint Test G .

Measure the resistance between the instrument cluster C220c pin 8, circuit 398 (BK/YE), harness side and ground.

• Is the resistance less than 5 ohms?

Yes GO to G2 .

No REPAIR the circuit. TEST the system for normal operation.
Measure the resistance between the tachometer and the instrument cluster printed circuit terminals; refer to the following chart:

Instrument Cluster Printed Circuit Terminal Tachometer Terminal C220a pin 13 C220a pin 15 S C220b pin 2 G C220c pin 8 G (6 CYL.)

• Are the resistances less than 5 ohms?

Yes GO to G3 .

No INSTALL a new instrument cluster printed circuit. REFER to Instrument Cluster Printed Circuit in this section. TEST the system for normal operation. G3 CHECK FOR CLEAN TACH OUT (CTO) CIRCUIT OPEN OR SHORT Check for CTO circuit open or short. Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

• Is the CTO circuit OK?

Yes INSTALL a new tachometer. REFER to Gauges in this section. TEST the system for normal operation.

No GO to G4 .
G4 CHECK FOR CORRECT PCM OPERATION Disconnect all PCM connectors. Check for:

• corrosion
• pushed-out pins

Connect all PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present.

• Is the concern still present?

Yes INSTALL a new PCM. REFER to Section 303-14 . CLEAR the DTCs. REPEAT the PCM self-test.

No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
Your best bet mite be to take it to a qualified repair shop.

Who manufactured the tach? Maybe they have a web site and instructions? Did you tach come with instructions?

I looked at autometer instructions for your vehicle, have to use an adapter, it ties into the power wire for your coil pack. The adapter costs about 97 bucks, not including tax.

Different tach manufacturers may have different hook-ups?

your tach is part of the instrument cluster and if it is not working then you might have a problem with the wiring harness... this will require more detailed assistance than that can be provided for free


if however, you are talking about installing an aftermarket tach, then follow the instructions that came with the tach

It should be black,but look on the coil,and it will have a negative sign in the coil next to the terminal like this - Now this terminal,will go to the ignition.

Check to make sure you are connected to the proper terminals, and that the wiring has no faults from tach to the terminals.

I had the same problem with the tach on my 92 Camaro. Tried the resistor fix but it didnt work. Finally found a tach board at the junkyard that worked for about a year.
I found a new replacement tach board. Only had it for about a week but it seemed to fix the problem! Hurray!!
NEW 1990 92 Chevy Camaro V8 Tachometer Circuit Board

If you have the one I'm thinking of, it is just to the left of the main power terminal on the cap (usually marked tach)

no, you need to buy an autometer tach adapter and tap it in to the harness on the passenger side firewall then run your tach from the tach adapter to your car. Dont mess with the cluster.
go to autometes website and it will tell you how to wire and what pin to splice in. The whole thing will take like 10min to do.

the signal wire is coming from the distributor under the hood run the wire through the fire wall to that wire and as 4 the wire that lights up the tach piggyback that wire off of the cigarette lighter on the fuse box

just check out this site
how to install a tach