Practise timed turns using only the compass, the turn coordinator and the stopwatch. Cover the DI and practise just flying around only using the compass, and learn which way to turn with it so it becomes second nature (left for numbers smaller, right for numbers bigger - unless your turning through North) and learn how to roll out on specific headings. The natural thing to do is to turn the opposite way to the actual way due to the way the compass displays its info to you.
Edit:
You could also take an instructor up and have a go at some IF flight under the hood, and have a go at limited panel too.