FSX Animation?

Have a SNJ2 I have started in FSX, No problem with animating the gear to go up and down but the problem is
with the compresion. I can't get it to work, Do I use the r_gear or l_gear tag or is there another tag to use?
with the compresion. I can't get it to work, Do I use the r_gear or l_gear tag or is there another tag to use?