Digital Instrument Cluster Whacked!

In my 1991 S-10 Blazer, I have replaced the Digital Instrument Cluster 3 times. One of them would have the speedo out, come back on, and while you were doing 55 MPH say 30 then 0 then 55 then 0. The one I have now is fluctuating now. I don't think it is the circuit board this time since everything works, and this has happened on a previous one. Possible loose wire? The problem with that is WHERE?! Thanks!

In my 1991 S-10 Blazer, I have replaced the Digital Instrument Cluster 3 times. One of them would have the speedo out, come back on, and while you were doing 55 MPH say 30 then 0 then 55 then 0. The one I have now is fluctuating now. I don't think it is the circuit board this time since everything works, and this has happened on a previous one. Possible loose wire? The problem with that is WHERE?! Thanks!

Send it to www.mrwhizard.com

if the speedo is the only problem, it could be a vss