Where are you doing your sim training? the ansett sim center have posters if you need them but they are lacking as it is just a photo of the dash sim put onto a A2 sheet of paper... it works but if you can a group named training crue make a good one for the 300 with fuel gauges in pounds. Dependent on the company your going to be with they might have the gauges in kg in the 100 but it will not make much of a difference on paper cockpits.
As far as free goes, there is possibly one in the Smartcockpit stuff that you could upsize and print out.