Tachometer Check

Attach an external high quality tachometer to the engine speed detection connector on the harness side (such as with a paper clip).
NOTE: For tachometer check, use an external high quality inductive tachometer.

Compare the readings of the vehicle tachometer and the external tachometer at every engine speed, and check if the variations are within the standard values.

Standard value:

TACHOMETER RANGE

Engine speed (r/min)	Indication allowance of tachometer r/min
700	600 - 800
2000	1900 - 2150
3000	2900 - 3225
4000	3875 - 4275
5000	4875 - 5325
6000	5875 - 6200

Fig 1: Attaching Tachometer To Engine Speed Detection Connector

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.