MPG (Handwheel) wiring and configuration needed in Mach3 , I have Red 4 axis mach3 board and standard handwheel.

Mach3 Red handwheel 10 socket port:

+5v | o o | GND
X | o o | Y
ACH o o | BCH
Z | o o | A
X100 | o o | X10

Standard MPG with ESTOP Wire Colors:

(Red Green/black) 5v
(Black White/Black Orange/Black) GND
(Yellow) X
(Yellow/Black) Y
(Green) A CH (Encoder)
(White) B Ch (Encoder)
(Brown) Z
(Brown/Black) A
(Orange) X100
(Gray/Black) X10
(Blue & Blue/Black) IN1 & DCM in BOB
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2 Config ports & pins Input signal:

OEM Trig#1 port 3 , pin 5
OEM Trig#2 port 3 , pin 6
OEM Trig#3 port 3 , pin 7
OEM Trig#4 port 3 , pin 8
OEM Trig#5 port 3 , pin 9
OEM Trig#6 port 3 , pin 10
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3 Config ports & pins Encoder/MPG's:

Encoder1 Enabled
MPG#1 Enabled
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4 Config System hotkeys:

Trigger 1 oem code 185 To select X axis
Trigger 2 oem code 186 To select y axis
Trigger 3 oem code 187 To select z axis
Trigger 4 oem code 188 To select a axis
Trigger 5 oem code 192 To select x10 jog step
Trigger 6 oem code 193 To select x100 jog step
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5 Config General Config... Jog Increments in cycle Mode:

Position1 1
Position1 10
Position1 100
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6 Program Run Alt1 Tab key Jog Mode MPG
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Notes:

0 Just use 5v pulse generator (encoder) , higher than this will damage your BOB.
1 Plugin control RnRMoton "MPG disable" must not selected
2 Check Encoder in Setting Alt6 MPG Diagnstic MPG1 ,by rotating encoder you can see count and velocity ; just by settings in step 3, you can check encoder test
3 In Program Run Alt1 Tab key Jog Mode MPG, you can see selected axis and jog step
4 to select axis and jog step you must push side key
5 Default jog step is 1 for encoder without pressing side key , pressing side key equal to selected jog step
6 To calibrate your MPG: Function Cfg's Calibration of MPG's
7 Do not forget to save any changes in Config save settings..