lathe tool up

I have 2 MPG(Handwheel) and I need to use one for x and one for z
And i need to change homing sequencing becose I have z homing first and then x

I assume you are asking a question?

I have 2 MPG(Handwheel) and I need to use one for x and one for z

You don't need 2 MPGs, just one and a switch to change axes.

And i need to change homing sequencing becose I have z homing first and then x

linuxcnc.org/docs/2.5/html/config/ini_ho....html#_home_sequence

If you have spare encoder components on the 7i77 connect your MPGs to them.
then connect in HAL the encoder pins to
axis.N.jog-counts
www.linuxcnc.org/docs/2.5/html/config/emc2hal.html#_axis_joints

There is more to it then that - looking for an example...
As ArcEye said you can use one MPG with a switch or one for each axis if you like.

If I remember right the 7i77 has a mode that adds special low speed encoder counters just for MPGs too.

Chris M