Wire size for NI 9751 and NI 9757

Hello.

I am trying to use both NI 9751 and NI 9757 module with cRIO 9045 controller.

Both NI 9751 and NI 9757 require a power from a battery, so I bought 12V automotive batter to power both of them.

1. Now my question is what wire size should I use when connecting the battery to the modules?

2. Also, what wire size should I use for NI 9751 if I want to connect the injectors to the module?

The connection distance will be within 10 ft. Thank you!