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Q:

instrument warning lights on 2000 Cadillac Catera

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when engine is started the traction control light is on, the check engine light is on, and the speedo, and odometer is also inoperative.
(1) Answer
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All the systems you mention need an input from the Vehicle Speed Sensor (VSS) mounted on the transmission order to work. The one sensor or circuit having failed is likely to have illuminated all the other warning light. A scan tool is need to retrieve codes stored in the computer of your car and then proper diagnostic tests will be carried out to determine what's wrong.