Speedo Sensor Noisy?

fastsc92

Registered User
For quite some time now I've had my PLX datalogger, and for quite some time I've never been able to get it to log speedo outputs. When hooked up to the logger, I get some sort of pulse, but its random and jumps all over the place when there is no movement in the car. I believe I tapped into pin # 3 on the EEC harness right at the computer.

I guess my question is, is this a noisy signal? Should I have tapped it somewhere else in the car, perhaps at the sensor itself or behind the cluster? Can I maybe install some sort of capacitor in order to filter out the noise?
 
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