Originally Posted by Johncabot
I believe you are correct about connections but there is only one at the read out. Gold plated and shiny clean.
How about the crimped-on connectors? Do the crimps still seem solid, any looseness or visible corrosion
in the crimp area? Maybe give them all a little squeeze with a crimp tool.
if you can borrow a known-good sensor, you can verify that the instrument is ok... hold the paddle wheel
under a running tap.
Longshot... If you know someone with a portable oscilloscope, using one to look at the pulses at the instrument coming from your speed sensor would tell you alot about the sensor and the wire. You should see nice fat rectangular pulses all at the same levels, no jumping about, no skinny or soft pulses, no extraneous signals.