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Shouldn't be an issue, as all you you are doing is adding another function, servo thread should be ok for MPG.
Give it a go and see what happens.

Thanks for this Chris, especially pleased to seeing the lathe part getting TLC 

I switched to develop branch and did the uninstall and reinstall, went like a charm!
I noticed that unlike Gmoccapy issuing G43 doesn't update the active G codes, G49 remains, is that expected?

Now for the newby bit, does tool touch off only work with an active (or passive) probe, so I need a probe wired in and configured to set tool offsets?
Or is this a G49 artifact from above?

Thanks again for this awesome interface and your work!

Then you need arc suppressors across the relay contacts.

Possibly something like this:

www.digikey.com/en/products/detail/bourn...OV-10D201KTR/2408223

Note that it looks like the relays have their own drivers, so the 7I95T does not need
any flyback diodes.

They are 120v ac so unfortunately can't use flyback diode.

The solenoids are ac 120v. So I can't use a flyback diode on them. Its the relay coil that is giving me spikes going back to the mesa 7i95t. So I need to stop that.

Yes, as tommylight says, the solenoids need flyback diodes as well as the relays.
( or if they are AC solenoids the relays need arc suppressors )

Do the solenoids draw more than 2A DC?  If not, they can be driven directly from the 7I95T
 

Thanks. I have a load of 1n4148s the problem is between which pair as the relay board has two grounds and one positive. One ground is from the psu and the other is from the ssr on the mesa board.

I have tied going from the psu positive to the mesa ground pin and it hasn't stopped the emi.

Your "usually......" is for power supplies, not solenoids and relays, very confusing info on the net, so better ask here.
The diodes musty be added to solenoids in parallel with their winding and as close to the winding terminals as possible, each solenoid must have it's diode, use 1N4007 or 1N4008 as are very cheap and easily found.
For bigger solenoids use 1N5407 or 1N5408.
For simplicity, the only thing to take care is the diode side with the line across must be wired to positive.