GASimPilot

Hello. Just learning StreamDeck and Pilot's Deck. I have familiarity with simvars. It has been great learning, but now I am stuck on how to add a command to a Display Value I have called Heading. I can display the current heading using (A:PLANE HEADING DEGREES MAGNETIC, Degrees) in the Value area and Variable address. However, what I want to do now is click on the button and have it sync my heading bug to the current heading. I can go into the Commands area and set Command Type to K-Var and the Command Address to a fixed value like HEADING_BUG_SET:15. But how do I replace the 15 with the current value of PLANE HEADING DEGREES MAGNETIC? Everything I try just doesn't seem to work. Thanks for any help.