I think you have to take apart your dash, get a haynes manual or of the like.
you have to replace it
To fix the tachometer on a 1999 Isuzu Trooper, first check the vehicle’s fuses to ensure none are blown. If the fuses are fine, inspect the wiring and connections at the tachometer and the engine’s ignition system, as loose or damaged wires can cause issues. Additionally, consider testing the tachometer with a multimeter to see if it’s receiving a signal. If these steps don’t resolve the issue, the tachometer may need to be replaced.
Nissan terrano 11 techometer not working
To fix a 12V diesel tachometer, first, check the wiring connections for any loose or damaged wires. Ensure the tachometer is receiving power by testing the voltage at the input terminal. If the connections are intact and powered, inspect the sensor or signal source, typically a magnetic pickup or alternator signal, for proper operation. If these components are functioning but the tachometer still doesn't work, it may need calibration or replacement.
To fix a tachometer needle that is stuck on the wrong side of the resting pin, first, carefully remove the tachometer from the dashboard. Gently pry off the glass cover to access the needle mechanism. Use a small tool to nudge the needle back to its resting position, ensuring it sits correctly on the pin. Reassemble the tachometer and reinstall it, checking that the needle functions properly before closing everything up.
The tachometer on a 1991 Acura Integra is wired through the dash. To reach the wiring remove the dash console and pull out the tachometer. There the wiring can be worked on using a spark tester to find the bad wire and solder unit to replace the wire.
An optical tachometer works by using a light beam or sensor to detect the reflections off a rotating object. By measuring the frequency of the light reflections, the device can calculate the speed of the rotating object. The tachometer then provides a numerical readout of the rotational speed in revolutions per minute (RPM).
clip it on your distributor cap
run a new line to the distributor.
To fix a non-working tachometer on a 1997 Ford F150 with a 4.6L engine, first check the connection at the back of the instrument cluster for any loose or corroded wires. Next, verify that the signal from the ignition system is reaching the tachometer by testing the signal wire for voltage with a multimeter. If the wiring is intact and the signal is present, consider replacing the tachometer itself or checking the powertrain control module (PCM) for issues, as it controls the signal sent to the tachometer. If the problem persists, consult a professional mechanic for further diagnostics.
Std. transmission could be "shift" light