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

Fig 1: Checking Tachometer To Engine Speed Detection Connector Terminal
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

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 values:

TACHOMETER CHECK

Engine speed (r/min)	Indication allowance of tachometer r/min
700	+/-120
3000	-100+225
5000	-125+325
6000	-125+375