96 LS400 135K. Took 300 mile trip, parked overnight. Next morning speedometer doesn't work. Drive around for awhile hoping it will start working again, but it doesn't. Start reading ops in this forum, several about wacking the instrument panel. Try that the next morning, it works. So I read some more, failing sending units, sticky needles, bad capacitors and lose connectors. What's the most popular fix these days? Two days later it's still working. Any proactive adivce would be appreciated. Thanks.
Bob Helms