OK, I got a lot of material to cover...
1. Air Pressure Sensor. (120lbs $20.00 on Ebay). Tricky, correct me if I'm wrong. But, 150lbs is the max, correct?
150
psi is max operating, but that would be pretty stiff, also even 120 psi, will put you near topped out (without rider weight). Hmmmm.... be very careful with those pressure sensors... we've had customers put on pressure sensors that weren't set to the correct psi or were either just operating incorrectly. Long story short, they kept burning up the compressors. Then they got mad at us when we wouldn't replace them for free. We do have a one year warranty on the compressor and solenoid, but it's going to be for a stock set up. We test them to see how they were damaged and if it was an install error or incorrect operation - not covered.
Rich, it sounds like you know what you're doing... but I wouldn't recomend a novice following suit...
2. If you're a little more creative, you can add a 2CH-4CH remote control ($20.00 on Ebay). One button kicks the solenoid to drain the system and bring it to the ground at 100ft.. The other button kicks on the air pressure sensor to bring it back up on command.
Always a good alternative, but there are pros and cons as well. We know our remote is a little pricier than others, but there is a reason. We had to pay alot of money for the R&D to develop it. Here's the scoop - when we were still a younger company, we tried different/cheaper remote set ups. The problem we were encountering was interference from the frequency that the vibration that the compressor made. What would happen is, that alot of the remotes would work slower or intermittently. What we ended up doing is spending the money to develop a remote specifically made for our system by a top of the line manufacturer. We have contracts that binds them to sell this exact set up to us only. Like I said it cost us, so it costs you a little more, but we feel it's the best remote for our system out there. It's 4 channel, and fully programmable. The up button we program to operate for 10 seconds with just one touch, this automatically puts you at ride height. Another button is down, and then you have two more buttons that you can program to operate any auxillary you want (LED lights, radio, etc.) If you have found a cheap remote that works without interference, more power too you!