Let me throw out a caution here although it applies to any lift not just scissor. Had my Jag on the scissor a couple of years ago just to do some front suspension work. Went inside to lunch and came back to this:
While I was gone for an hour the lift slowly lowered the car to the ground. No damage done but of course why?
My system is similar to most I would guess with a control panel, pump, hydraulic fluid tank and hoses to the lift. I did a beautiful job tucking my panel and tank in the corner wedged between to metal cabinets. Only thing that you could see were the buttons. It looked really tidy and custom. No pic unfortunately.
After pulling the cabinets away from the wall there was a large puddle of pump oil on the ground,. A fitting from pump to the lift had failed at the pump end and slowly lowered the car to the ground (I think. I was not there to see it.)
So what is my point? I believe the fitting had been cracked and leaking for some time. Since everything below the control panel was not visible I never saw the volume dropping in the tank over time. The entire puddle, about half a tank worth was hidden by my nifty installation between the two rolling cabinets
Now I have my panel/pump/tank out in the open where I can look at the tank every time I get under the car and see underneath the pump looking for any fluid accumulation. Not as neat and tidy, but safer.
And one more thing. Yes the car was below the safety ratchets. I was sitting on a stool outside the footprint of the car and wanted the front suspension right in front of me. This position was below the last ratchet, but I reasoned this was ok because I was not under the car. Lesson learned.
Beautiful installation btw. I just park over mine.