Is there such a thing as a reset for the Autohelm WIND ST 50? I purchased a boat with one that showed proper wind angle but not speed. I removed the sender, greased both the wind vane and cuos. now

I assume you have an ST-50 or ST60 windvane setup. These are the calibration instructions from the unit manual for the ST-50. They are the same for the ST-60 and ST-60+ units.

Hope it helps you.

Initial Calibration Windvane Alignment
Before the unit is used for navigational purposes the masthead transducer must be accurately aligned to the vessel. Before this procedure is carried out the windvane should be linearised as follows.

1 . Powerup lhe ST50 Plus Wind instrument.

2. Tum the vessel through two complete circles, making sure that the windvane remains in line with the wind -the instrument will automatically linearise the windvane.

Alignment
1. Press and hold CAL for 2 seconds until CO is displayed by the LCD.

2. Press < > to move the pointer to the correct wind angle.- WIND
- Press < > once to move the pointer by 1 degree.
- Press < > for 1 second to move the pointer by 10 degrees/second.
The LCD will now display the applied correction.

3. Press and hold CAL for 2 seconds to exit and store windvane alignment.

Windspeed Unit Selection

1 . Press and hold CAL until Ul (Knots) or U2 (Meters/second is displayed.

2. Press CALwithin 8 seconds to change the windspeed units selection.

3. After 8 seconds the wind instrument returns to normal operation.

Hi!
The only thing i could possibly add to sailsteve's answer would be to provide you with the link to your owner's manual.
-Steve