Remove the instrument panel cover. Remove the tachometer retaining screws. Remove the tachometer cable from the back of the tachometer. Reverse the process to install the new tachometer.
you need a tachometer
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The tachometer cable may be faulty. The tachometer sensor, on the side of the engine might not be functioning properly.
The Mazda tachometer and the speedometer have separate cables. The tachometer cable probably does not work properly. Change the tachometer cable.
The tachometer wire on an ECU is typically purple in color.
The tachometer in my car measures the engine's revolutions per minute. The mechanic adjusted the tachometer to ensure the engine was running smoothly. The driver glanced at the tachometer to check if the engine was being pushed too hard.
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you dont need to cause it has a factory tachometer
You can perhaps buy a used portable tachometer by going on to www.amazon.com
Here's a site where you can buy a handheld tachometer: http://www.checkline.com/tachometers/
Calibrate it at sea level and then again at an elevated position where the height it known. This would allow one enough reference point to calibrate it accurately.