I just bought a 2010 Ultra Classic, Tri Glide. The guy I bought it from didn't know how to do anything on his trike. So now, I have a question, I hear I need to check the psi on my air suspension, but how do I do it? I have a HD pump to do the job, but I don't even know where to look for the fitting. The man before me had it for 12 years and only put 5126 miles on it.