If I recall correctly you want to set the pressure so that you have ~25% sag. I run my '95 with ~7mm of sag.
Ah, here it is:
"ALPS SET-UP INSTRUCTIONS
To get the best performance from your FOX RACING SHOX, it is necessary to adjust sag. On your FOX ALPS AIR SHOX this is done by adjusting the air pressure. The air pressure is determined by the rider's weight. Setting sag/air pressure will determine how much the shock compresses when you sit on the bicycle. Increasing air pressure will make the shock stiffer. Decreasing the air pressure will make the shock softer. Note: It might be necessary to change air pressure to achieve the proper sag setting.
The following set-up procedures will help you achieve the optimum set-up for your FOX AIR SHOX.
1.
Sit on the bicycle in a normal riding position. Your weight should be on the saddle with your feet on the pedals. It may be necessary to hold yourself up against a wall or post to steady yourself. Make sure your weight is distributed on the saddle and pedals as it would be in your normal riding position. Do not bounce on the pedals or saddle.
2.
Slide the O-ring on the shaft until it is positioned right against the black rubber wiper seal on the shock body.
3.
Carefully get off bicycle without compressing the shock more than the amount with the rider in a normal riding position. Try not to bounce on the rear suspension while dismounting your bicycle.
4.
Measure the distance from the O-ring to the black wiper seal. This distance is the amount of sag. This distance should be 25% of the shock travel. If the distance is not correct you need to add or subtract air pressure to achieve the proper sag.
CHANGING AIR PRESSURE/ ADJUSTING SAG:
1.
Locate the air valve on the shock and remove the valve cap.
2.
Screw your FOX RACING SHOX pump onto the air valve until the pump shows pressure on the gauge. Do not over tighten.
3.
Add air pressure by pushing on the pump handle until desired pressure is shown on gauge.
4.
Unthread pump from air valve; check sag.
5.
Repeat step 1-4 until proper sag is achieved. Replace valve cap after sag is set.
CAUTION: !!! Do not cycle your ALPS FOX RACING SHOX without air pressure. If your shock is compressed with little or no pressure, add air to re-extend the shock.
SETTING REBOUND
Adjustable knobs for rebound can be found on both ALPS 4R & 5R shox. The 4R features a blue adjuster knob, and the 5R features a red adjuster knob.
Rebound setting is adjusted by the clicker knob on your FOX RACING SHOX. The rebound clicker controls the speed at which the shock returns after the shock is compressed through the stroke. This knob gives your SHOX a wide range of adjustment. This adjustment will enable you to tune your SHOX to any air pressure and riding condition. The proper rebound setting is a personal preference and varies depending upon rider's weight and riding style.
Rebound setting guidelines:
Rebound should be as fast as possible without kicking back and pushing the rider off the saddle when riding the bike in rough terrain. If the rebound is too slow the suspension will not function properly and the wheel will not follow the changing terrain. Determining the proper rebound setting may take a number of rides. During the first few rides adjust the clicker and note the different ride characteristics. Your rebound clicker setting may change with different riding conditions.
Note: Regular maintenance of your bicycle’s suspension pivots will help ensure the proper performance from your suspension. "