Have you looked into Classic Instruments? They sell really nice combination units in all different sizes and styles, may even have some mounting options for you. I'm not sure I've seen just oil press and amps there.
I wonder if they'd do something custom for you. Not cheap, of course, but if they can do those gauges they have now, why not something a bit different?
If you did the charging port, you'd have to remove the glass lense for the gauge, no?
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