Tachometer Check

Attach an external high quality tachometer to the engine speed detection connector on the harness side (such as with a paper clip).

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

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.
1. Standard value:
Fig 2: View Of Tachometer Indicator Range Specifications
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.