It means:
a. Speedo was working fine before the rain.
b. Condensation is on, around, a magnetically charge piece of hardware.
c. I don't know how you see it, but magnetism makes a voltage value happen.
d. The hard parts inside the speedo; do not like water/condensation/high humidity and/or static kind of electricity over its parts.
e. What I don't know is this. Why the change in numbers at the speedo? The water is laying over a train track at a depot station> imagine. So imagine a spot of water over two rails that are moving things in the opposite direction; the water can cause a 'new resistance' over those soldered parts so close together.
f. So I more or less am taking a guess of said new-resistance is a different binary getting thru or magnetically dragging down so many milliamps of WATT is the next step down under a milli or so low a milli, this is read at a different voltage value. It forces the hard parts that calc thru some truth table and it says, 'wrong milli number' and spits out a re-calc'd number that works anyway. So the speedo is functioning none the less.
g. That's where I take a table fan, on a big box, or tie the fan over a garage beam, lower the fan down to the level of the speedo, but more I find the rain entry angle and blow it dry with the fan; and let it ride for days. I could tape cardboard over the fan, cone it down over the speedo and shorten the air dry time.
h. I'm taking my bathroom reader, which I open on a pissing contest basis, and when I mean open, it's a Random page. I read it backwards so I am more confused if starting out with page 1.
Make Sense Now?
Singed,
Reversengineer the fucker