I’m not at my pc at moment but have you imported the Lvars and hvars, it’s in the how to pdf with axis and ohs , you can only import hvars when not in msfs, lvars I think you can import whilst in msfs andaxis and ohs.
Once imported you should get more variables to use, however it is trial and error getting things to work at first and it’s not always obvious what works with what, it took me about a week to set up the dc6 with help on the forum.
I will be on my pc tommorrow pm and will have a go at setting up Cessna 172
I’m on GMT, what time zone are you in?