Firewall Bulkhead connector
That chart may be a little bit "slim".
For example, this chart
Automotive Wire Size Calculator – Wire Gauge Chart | MGI SpeedWare
Let's take an example of a 25A fuel pump (rear) with a front mount battery and say, 15ft of wire. Bear in mind the wire is the TOTAL, the return path included. That chart would suggest no 10 for such an example. Length of wire matters, and so does "allowable" voltage drop
