Jegs sells a low fuel psi switch kit that is adjustable.(5to25psi). a little pain to set at 10-12psi but if your fuel pump is adjustable you can turn it down till lite comes on or off ,then reset your pump.

I need to run back and place a link to this...

the adjustable part is pretty good. but i dont think you can beat a fp gauge. to me its easier seeing real time pressure. as the pressure would begin to drop as your filter is filling with contaminants you are able to see it slowly drop and know there is a problem before the warnig light comes on. i have been thinking of putting one in addition to my fp gauge in case of a quick failure of some component in the fuel system.

the adjustable part is pretty good. but i dont think you can beat a fp gauge. to me its easier seeing real time pressure. as the pressure would begin to drop as your filter is filling with contaminants you are able to see it slowly drop and know there is a problem before the warnig light comes on. i have been thinking of putting one in addition to my fp gauge in case of a quick failure of some component in the fuel system.

I agree, a low psi light does not tell the whole story and really isn't worth the cost or hassle. If you really want one you should do it in addition to, not instead of, like you mentioned.

http://www.jegs.com/i/JEGS+Performance+Products/555/41373/10002/-1 Found it... Yes... I've got a low pressure light get my attention that something is wrong...

my fp guage is mounted on intake to the fuel filter. i had a BD 5 psi lite at ip.(lost IP be before i had guage) wanted to change to a higher psi so icould tell if fuel filter was getting bad at a higher psi. fabed a hose w/ valve for a snubber on the new psi switch.hope i made sense