i think its done by sliding your hand along the string, touching it lightly as you would for a normal harmonic....then the hammer ons and pull off pluck the string so u can get the harmonics..

its the same as if u were picking with your right hand and sliding your left hand instead
Still having a bit of trouble getting the harmonic sound to get out there. Any other tips and tricks?
it's just a pick slide with some hammer ons. there aren't any harmonics other than the ones actually from the pick slide
1978 Peavey T-40 -> Ampeg Micro-VR - > Ampeg SVT210AV + Ampeg SVT-15E