CIS Fuel System pressure Gages

I want to start sorting out the CIS fuel system on my '79, and would like to start with getting readings on the system and control pressures. Can anyone recommend some good Gages to buy? Or would a generic set from harbor freight do the job? The JC Whitney ones in Richard Andrade's "928 K Jectronic CIS Fuel Distributor Rebuild" discussion are no longer available.

I found this thread on rennlist.
rennlist.com/forums/928-forum/817339-cis-testing-equipment.html

The harbor freight tester works well if we remove the schrader values.