the 4 wheel drive lights flashing back and forth on 2008 Toyota Tundra

my 2008 tundra has the check engine light, 4wheel drive flashing and will not go into 4 wheel drive and the speed ometer doesn't work. ???? help thanks

Asked by for the 2008 Toyota Tundra
Sensors are shared by many systems in a newer car by the sounds of things the Vehicle Speed Sensor or its circuit has has failed, not a very expensive repair. Repairing the one fault will solve the other "warning light" issues.