The underside of the switch has two sets of 3 pins terminals and one set of 2 pin terminals
0          0          0
0          0       
0          0          0
These 2 pins connect to the internal normally open internal switch. To close switch, press on the inner shaft
A
B
C
D
E
F
A      B      C
D      E      F
When wired, just insert the 3-pin female connectors into either the Model 2090 or the 2095A Encoder Board.
Underside of Switch
The 3-pin Female connectors are provided with the purchase of the 2090 or the 2095A Circuit Board

Take some stranded wire (#28), up to 14 inches in length and solder terminal A on the switch to terminal A on the 3-pin Connector. Then B to B and C to C and so forth until all 6 terminals are soldered to the connector.