[Kashey]

Hold the trip computer button down then start the engine. When "test" (or "Check" don't remember exactly) appears depress the button. Now you are in test mode. Press the button again. It'll test your instrument cluster. All needless will go up and down. Also you can test rpms and speed by pressing the button few more times and take the car for a drive. You will see your RPMs or Speed on small trip computer display. Both cluster test and rpm and speed test will show you if or or your cluster is bad or your sensors are bad.

ABS - most luckily it's your ABS sensors. They are easy to replace but pricy.
Another possibility is your break fluid level sensor.