Is the PSI the same in all pumps?

No, at Tuff Stuff we currently carry pumps that are valved at 1200-PSI and at 850-PSI. Most applications will accept the 1200-PSI pump, with exception of the Mustang II rack, which uses an 850-PSI valve (Tuff Stuff #6174)

What is the difference between keyed  shaft power steering pumps and press on power steering pumps?

Most early vehicle pumps came with a keyed pulley which was nut retained. Most late vehicles were revised to a press fit pulley. The nut retained style pulley can be easily removed and reinstalled. Once the press fit pulley is installed, it is not recommended to remove it and reinstall it because the pulley I.D. becomes stretched and it may slide off the shaft. Car builders prefer the universal keyway fit #6176A because of its flexibility.

What is the difference between a metric pump and a SAE pump?

There are two differences between these pumps. The SAE pumps use a flared fitting for the pressure line and the mounting bolts are Standard American Equipment. The metric pumps use an O-ring.

How do I mount the power steering pump when the bracketry is missing from my engine?

Tuff Stuff has a wide variety of power steering pump mounting bracket kits for both the Saginaw and Type II pumps. The brackets are laser cut from ¼” steel plate and are available in either a black painted or chrome plated finish – and are complete with fasteners.