Well I'd first troubleshoot it and find out if the speed sensor is in fact faulty. It can be any number of things and since the sensor itself is fairly simple in design, it's likely something else causing the speedometer to only work intermittently. Start by checking the connection at the sensor, then inspect the wires. You may find a break somewhere causing it to lose continuity. You may also check the connection at the back of the gauge cluster. Perhaps a loose ground somewhere or a faulty fuse. And then of course, there's always the possibility of a sticky needle.
You can also perform an instrument cluster test by holding in the trip reset button while turning the key to position 2(IIRC), cycle through the tests by pressing the button repeatedly. One of the tests will trigger all of the lights to come on and gauges to cycle completely.
And finally, you can find part numbers and diagrams on realoem.com. I recommend plugging in the last 7 digits of your vin and then creating a shortcut to your desktop for easier reference later down the road. Best of luck.
Last edited by cooljess76; 01-13-2011 at 02:24 AM. | 
"If the world turns it's back on you, grab it by the hips and pound the crap out of it"
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