(require 'tramp)
(push "/path/to/git/directory/" tramp-remote-path)

Magit 20170808.1712, Git (unknown), Emacs 25.2.1, darwin

"Error in post-command-hook (magit-auto-revert-mode-check-buffers): (file-error "Searching for program" "No such file or directory" "/path/to/git/directory/git")