How to crimp JST VHR series?
You could get the crimper and put terminals directly onto the wires you have; the part number is WC-930 and it's almost $500.  Or, you could get pre-terminated jumpers from Digikey, et. al. and splice them onto the wires.  They're less than $1 each.  The contacts have a little tab on them that latches into a notch inside the connector housing.  Just don't screw up the wiring since the extraction tool is $200.