The encoders in the three kits I still have were quite  different physically 
from the ones in the factory 301 s I have, or in the Omni's. 
The kit encoders were very similar to a Clarostat 2 Watt potentiometer, with 
three leads. The shaft was a standard 1/4" shaft, just a bit too long to 
allow the drag function of the stock Omni tuning knob to engage. 
I did confirm the wiring on the kit, which is as follows
The hookup from the DB-25 to the encoder is
pin 16  5 V+
pin  8   encoder phase 1
pin  5   encoder phase 2
pin  1   chassis ground
pin  14  chassis ground
Of course, any encoder that will function properly on 5 V should be usable. 
73  Pete Allen  AC5E
 
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