WARNING: This page is about a different car, the 2002 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pinpoint Test G: Incorrect Tachometer Indication (G1-G2)
Courtesy of FORD MOTOR CO.
Fig 2: Pinpoint Test G: Incorrect Tachometer Indication (G3-G42)