For fuel pressure you need
Hi Bob
The combination vacuum fuel pump gauges are best as they are low range. Most oil pressure gauges just don't give fine enough gradations.
I've got an old Heathkit combination dwell, hi-low tach and volt meter, still works great after 40 years. (Got the manual out for it last year and check the calibration and it was still dead on.)
Talking of tachs what ever you do don't buy one of those little self contained small engine hour meter and tach units. I've tried 4 different types and non-of the ones I have worked well or for very long. All the ones I've had have non-replaceable batteries and they don't work worth a dam below 40F loosing memory.
Cheers Phil
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