Yeah, good idea, that would provide some benefit. Kind of like the "fuel filter" restriction warning idiot light some of the old pre-Powerstroke diesel Fords had.
Or if you added an aftermarket lift pump, as some folks do, then a pressure gauge at the IP inlet (like the Cummins guys do) would inform you of whether that lift pump was working as intended, and any loss in pressure would inform you of filter condition.
But the lift pump isn't needed and thus neither is the gauge to monitor it.
And arguably since a lift pump is not needed, adding one (and/or the gauge) only introduces one more potential failure point into the system. Some people add lift pumps anyway, and it is true that some corner-case arguments exist for them -- easier fuel filter changes, easier repriming of the fuel system if you run the tank out of fuel, etc. But if you add a lift pump and then the lift pump fails and blocks fuel flow, leaving you on the side of the road, then you're worse off then you were before without it.
If you have room for more gauges in the dash pod, I think oil temperature and pressure would be more helpful options? Battery volts maybe if you don't have it already? Altitude? That could be fun to watch.
