Watched
Unhinged (1982)...
Slow moving and some awful acting by the "college girls" but atmospheric....and this one has a great final scene which makes it ok in my book.
A few good kills as well,although I thought at first that the first one was rather clumsily staged (seems the framing is off,more below).
Definitely somewhat influenced by Hitchcock's Psycho.
$spoilers$
I watched the UK dvd and the first murder's framing is off it seems.
If you have it,compare it to the clip below.
I wonder if the US dvd has this correctly framed?
[edit] could it be the BBFC wanted this re-framing on the UK dvd?