The starter already has an 1" 1/8th socket fitted, this is the same as our bike uses. You will need to provide your own 12v batteries. I suggest 2 x 12V linked in series to make 24V, then make up a 3 - 4 foot cable tail with the Anderson plug to connect to the starter's electrical plug. Put tick them in a plastic box to make it easy to carry. Long cables mean you don't need to take it out of the van when starting in line.
2 pictures. 1 showing us using one of the starters during the filming of Speed Dreams at Santa Pod Raceway, the other is a close up of my drag bike with the Anderson plug in the background "Circled in black".