Shift Light (Manual Transmission)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1991 GMC Pickup, 1991 GMC Cab & Chassis, 1991 GMC C3500 HD, 1991 Chevrolet Pickup, and 1991 Chevrolet Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This light shows driver when to upshift for best fuel economy at any acceleration. Driver should disregard light during downshift. ECM controls activation of SHIFT light.