Correct tire pressure for my 1974 Porsche 914?
 

My customer have just bought a 1974 Porsche 914 2.0L and it is sitting on Falken ZIEX ZE-512 tires. The sizes are 205/60R15 Front and 215/65R15 Rear. My customer have no idea where to set the tire pressure for normal street driving. Can someone please help. The tire and wheels are not the stock sizes that came with the car in 1974.
MB STAR C5