I have an 85 Westy with the Behr A/C  unit. It may take up some space under your
dash (especially behind the glove box) but it works great if properly maintained. The
only drawback is that the radio now has to be housed in a housing  mounted face-up
in front of the shifter. I'm currently making plans to build an overhead console to
move the radio to and install a monitor and map lights. Probably won't  started on
that project til springtime.