Without schematics you may have to do some reverse-engineering, what kind of spindle motor is it? 3ph, 1ph etc. How is it powered up right now? if it has a relay or contactor then you can wire this in to the e-stop contactor or relay.
Same with the pump, (reverse-engineer) although with a centrifugal type pump, shutting the flow off actually decreases the current, but a side effect is possible temperature rise.
If it is immersed in coolant, this may not be a problem.