Clarence,

The light can be turned off easily. Behind the speedometer, the plastic cover comes off to expose the rear of the cluster. There is a small slide switch on the rear of the speedo, left of the speedo cable. I usually look through the windshield, standing in the doorway, and locate the switch. Using a small screwdriver, move the switch to the other side, and voila...no more light on.

Can't help with the codes yet, as I have not tried the motions myself.

Russell

1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya