Buy one of these with the generic adaptor fitting: http://www.motiveproducts.com/
The Motive bleeder is the next best thing to gravity feed and it makes brake repair a one man operation. Makes it easy to bleed those Maxima or 240SX calipers where the bleed screw is not vertical.
Brake Differential Pressure Safety Switch: See pictures. The brake switch has a piston that shuttles to the low side of the brake system if there is a leak in the front or rear brake circuits. As the piston moves towards the low pressure side it makes contact with the wire that turns on the brake failure light. I took mine appart and it appears that the piston will return to the central position once pressure is equal for the front and rear brake circuits. I found no mechanism that locks the piston in the rear or front brake circuit position. If the piston/cylinder is corroded, then the piston may stick in the bore and not return to the center position. My switch was badly corroded inside so I removed it and replumbed the lines to the master cylinder. Do not "gut" the brake switch. If you do you will tie the front and rear brake circuits together. Most likley, once you have all of the air out of the brake system the brake switch will not be an issue
Again, bench bleed the master cylinder until there are zero bubbles. When you see no bubbles let the MC sit for awhile to allow small bubbles to gather and then pump the piston and bleed a few more times.
Be methodical. Start with the MC and work each caliper until there is no air.