Bad Speedo?

#1
I've seen on other threads that older Corolla's are prone to bad speedos. My '98 LE has been through 2 speed sensors (on the tranny) and 2 instrument clusters and it's still acting up. Any ideas on how to trace down the potential bad grounds in the tranny circuit? Should I take her to the dealer and have them run a diagnostic on it?

Thanks for any help ya'll can give.
 
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