Hey guys - I have a weird issue with my speedometer that I hope maybe someone can help me with. I have a 2000 TJ, with an NP231 Mega Short Slip Yoke Eliminator (SYE) Kit with Speed Sensor. The speed sensor was a gear drive, and now it is a magnetic speed sensor with a tone ring. After installing the SYE, the speedometer was off by a bit, and it also fluctuated up and down about 20 mph while driving - which caused the transmission to upshift and downshift with the speedo changes. I installed a Dakota Digital SGI-5 interface on it about 6 months ago, and voila - everything worked! I got the speed stabilized, and I also got it reading accurately. Now fast forward about 6 months to about a month ago, and now my speed is fluctuating again, and it isn't at all consistent. I talked to Dakota Digital folks, and they suggested that the I measure the AC output of the speed sensor coming off the SYE housing. I was never actually able to get a good read on it, but I assumed since my SYE was only about 9 months old that it was probably ok. Maybe it is the culprit, but it is $120, and I don't really want to spend that kind of money just for trouble shooting. Have any of you experienced a speed sensor failure from the Rugged Ridge kits, or had similar issues with either the Dakota Digital interface? I've also read that it could be the PCM in the Jeep? I am to the point that I will probably have to take it to an auto electrician to troubleshoot it - unless some of you geniuses can help me.