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There are two common sizes 0.093" and 0.062", you need a 3-way housing and 2x male crimp pins. That is probably 0.093" pins which would be approx 5 mm pitch = distance between hole centres on the plug. If so pinballmania sells what you need
Happy to help. Btw, the smaller 0.062" crimps are 3.68mm pitch on the plug. Pinballmania has both sizes. Hopefully you have the pinballinfo approved crimping tool, this is a great investment as does both common sizes of the wire-to-wire plugs and the board header plugs too. https://www.ebay.co.uk/itm/Crimping...-PC-Connectors-Terminals-HT-225D/120933035908
The link below is one of the best guides to crimping - clear, simple steps. In his example its for older solid state games but principle is exactly the same for 80s/90s machines