Center setting bar as follows:

WARNING: This page is about a different car, the 1996 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Turn camshaft, with setting bar in place, until one end of setting bar touches cylinder head.
Measure gap at other end of setting bar with feeler gauge.
Select feeler gauge that is one-half of measured gap, and temporarily install between setting bar and cylinder head.
Turn camshaft so that setting bar is resting against feeler gauge, then insert second feeler gauge of same thickness at other end between setting bar and cylinder head.

Fig 1: Setting Engine To TDC For Cyl. 1 Cylinder