A selection of automotive diagnostic tools comprising a vintage Stewart-Warner mechanical hand-held tachometer and an Actron engine compression tester. The tachometer features a dial face reading R.P.M. in hundreds from 0 to 35, complete with original foam packaging insert. The Actron compression tester features a dual-scale gauge reading 0 to 300 psi and 0 to 2100 kPa x 100, accompanied by a flexible rubber hose, quick-connect fittings, and a bag of replacement O-rings.