How to view FPS in watch dogs

Solution
Try FRAPS
http://www.fraps.com/download.php

Take a look at some of Tom'sHardware benchmarks and adjust accordingly for desired FPS result
High-1920-FR.png


Don't forget the screen resolution !
Yeah, after driving around for a while I'm pretty satisfied with what I got:
2014-06-02 12:09:02 - Watch_Dogs
Frames: 6633 - Time: 114645ms - Avg: 57.857 - Min: 38 - Max: 77

Ultra preset with FXAA @ 1080p borderless fullscreen.

Specs:
Cpu: i5 4670k @ 4.2ghz
Ram: 8gb @ 1866 Cas 8
GFX: GTX 770 4gb @ 1.18 clock and 1.75 Mem