4L60E/Speedo Electronics Help Needed

[NPilot1975]

I am having problems with my Autometer Ultra-Light Electronic Speedo, the needle bounces around erractically mainly above 50 mph. I have an elecronic cruise that works fine even when the needle fluctuates and also the odometer seems fine. I was messing with it today and it seems that it is mainly when it shifts into 4th gear. It could very well be a problem with the speedo, but do any of transmission guys know if the trans could cause this? Maybe a bad servo or a short? Thanx for anyone that can help!

[cooters]

more likely to be the gauge if the cruise still works. The speed ring and sensor tend to be a work or no work item in my findings

[snj8198]

I have the same speedo and experienced same problem when I first hooked it up. I talked to the at Autometer's calibration department and they told me to make sure the electronic sending unit's lead wires were twisted around one another. Why??? I don't know but it worked. But now my speedo does not read below 15 mph then jumps up to speed once im over that speed. But twisting the leads did help my higher speed needle bouncing.

[NPilot1975]

SNJ, you are talking about where it comes out of the side of the VSS? I will try that tomorrow.

[snj8198]

Hi NPILOT. Yeah, the 2 leads that come off the side of the VSS need to be twisted. [B]And[B] the wires running to these leads must be twisted the entire length to prevent any signal interference. Remember: Black is the signal lead, White is the ground lead. I know black is usually considered ground but not in this application. Also, don't run these wires parallel with any power source wires or you risk interference from that also. Good luck!