Without a G meter, there is no way to know when you have exceeded your aircraft limits prior to exceeding them. This is true in real life.
In all metal aircraft, the first indication you will get that you have exceeded G limits, will be when something fails. You would hear a loud pop most likely, if it is any major component.
Note that cummulative fatigue can go unnoticed until you do get major structural failure!
Given that we are flying simulators, I would say that a nice selectable option would be to have rough G indications that would display on your screen. Maybe you would have a green indicator for 1-3 G, a yellow for 4-6, and red for 7+. This would simulate using only tactile (seat of the pants) sensing of G forces when flying the airplane.
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