Broken Speedometer question

Koa04

Member
Nov 12, 2003
55
0
7
Hawaii
I've searched the threads and found some info on this but still have some questions. Here's some background.

My speedometer just stopped working a few weeks ago. No weird movement of the needle or anything. Started the car, started to drive, no speedometer, period. I wasn't doing any work on the car at the time or prior to the malfunction.
Odometer works fine as does all other electronics in the car (with the exception of a slight engine feedback through my speakers). I also run a vehicle dynamic processor through my flat screen which shows some vehicle output (MPH, Tach, Lateral G's, etc) . The speedometer portion of that device works O.K. but has never been super accurate. I believe this device is attached into the speed sensor. This processor has been hooked up for several years prior to the speedometer failure. One last bit of info... I have aftermarket gauges in for a few years as well. They are autometer (Roush Style) gauges. They have about 20,000 miles on them since their install. I doubt they are bad.

Where would I start troubleshooting?
 
I had problems with my speedo. I have aftermarket guages as well. I made the problem go away by replacing the ground that goes from the motor mount to the frame. Its under the car on the driver side. Hope that fixes it.