My circuit's voltage input can range from 6V to 12.6V. I want to use a p-ch mosfet for reverse bias protection. However, the FET I want to use has a maximum VGS of +/- 8V, so I have to protect it in case the input voltage is on the high side. Am I correct that I should choose a zener diode voltage lower than 6V but higher than gate threshold? Any gotchas with the zener to be sure it works with the full range of voltage input I'm working with? I'm not too familiar with the ins and outs of zeners. Specifically, is there any harm in using TOO LOW voltage zener here (so long as the gate threshold is below the zener voltage). Reason is economies of scale as I have 3V zener used on the board elsewhere.
Also: Would a simple potential divider do the job? Or is a zener better?