Hi, fellow Xplane user here.
Do yourself a favour and download the Zibo mod 737. Its produced with input from real world pilots to make all the systems, flight characteristics etc as close as you can get on a desktop pc, and its updated very regularly. To say that its free it really is an astounding piece of work. There are also plenty of free add ons to enhance the sim. One of the rw pilots involved with it (Flightdeck2Sim on youtube, well worth watching and one of my favourite channels) rates it above any payware available for other simulators.