I think you have to take apart your dash, get a haynes manual or of the like.
you have to replace it
Nissan terrano 11 techometer not working
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.
Std. transmission could be "shift" light
Did you ever find out the problem? I'm having the same issue.
If you mean the " BRAKE " light in your dash it's just under the " 0 " on your tachometer
Check engine light : Gauge cluster without tachometer ( under the engine oil pressure gauge ) Gauge cluster with tachometer ( just to the left of the battery voltage gauge )
* P1693 Tachometer Circuit Low Voltage http://www.allpar.com/fix/computer-codes.html