Any issues using different power supplies for pi4 and amp2

I'm installing a bunch of gadgets (camera, usb gps reciever, pi touchscreen, etc) to my pi4 and installing that in a truck. I'm a bit worried that there won't be enough power for all the devices and an amp2. First, will that still be enough power? Second, if not, is it ok to power the amp2 separate from the pi?

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