I suspect that your light coming on has nothing to do with the pressure sensor. Especially if it only comes on dimly. This light is activated when it gets a ground. The ground can come from either the parking brake pedal or from the pressure sensor. I suspect that it is getting grounded somewhere else. I would chase the wires coming from the light to these two places and see if a wire is chafed or damaged where it could be getting grounded. To narrow your search, try ungplugging one at a time to see if the light goes out, if it does not then unplug both of them, if the light still does not go out then you know for sure that there is a ground connection somewhere in the wires that is not supposed to be there. Hope that helps.