Fuse to the fuel pump blew - apparently this is common on 911s of this age. Replaced the fuse and it's been fine since.
A brake caliper started leaking fluid. This is the fault of the guys who replaced the discs before I bought the car. Easily remedied.
The battery can go flat fairly quickly. Leave the head-lights on for ten minutes and it's a call to the AA to get her started.
This car takes a bit of getting used to, but when you're used to the tempermental gear box and unusual handling, it's a blast to drive.
My 911 is 26 years old and still turns heads, particularly when I open her up and that throaty roar makes itself heard.
She effortlessly leaves all, but the most powerful competitors in her dust.
I have to agree about the temper-mental gear box. The old cable shift can be a little tough to get into second gear when the gear box is cold. This problem was improved in the mid 80s when they switched to a hydraulic shift. Besides that, I absolutely love my 81 SC... A true classic.
So 1 year on and I'm still driving my 79 911. I still love her too.
The main observation I'd make is that you need to be prepared for those small parts that fail with age. I had to replace the head lamp and hazard light switches, the electrc window motors and switches, and the ignition switch. Apart from the obvious inconvenience I didn't mind as I am realistic about the fact that the car is nearly 30 years old, and used or new parts are easily sourced and well priced.
I have just purchased a 79 911 sc in white with full history I love it, at this present time it is a carcoon that's what week ends are all about,