So my mph gauge started tweaking out. It started after a huge rain storm that hit all week. I'm just trying to figure out if i need to change the sensor and where to see where the sensor is at?

 

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1994 Honda Civic d16z6..... Daily Driver

If that is still correct from your sig... Check out your VSS (Vehicle Speed Sensor), very often it gets wet and then messes up the signals to everything else.

Sometimes the pin inside the plug is corroded or the vss is corroded, the pin could be broken inside the harness plug (what my personal problem was), or a wires sheath could be ripped and causing a short when wet.

Anyways, this will be on top of your transmission, behind the starter. Sticks up from the top, and goes into your FD. Take it out and inspect, along with the harness plug... Clean if need be and use lots of electric grease and call it a day.

Thats where i would start though.