If your technique is good, you can get pinch harmonics on an acoustic guitar too. But till you get there, here are some things that will help it initially so that you can build up that technique...
1. Drive/distortion: The more the better... If you have a overdrive pedal, put that before the distortion to give a top boost so that harmonics are easy to pull off.
2. Equaliser: Set all eqs to boost high mids and treble. This may sound terrible to play rhythm with so once you get good with the technique, you can eq it back as you like.
3. Pickup: Pinches should be easiest at the bridge pickup. Also, it is easier with brighter and hotter pickups. Also, adjust your pickup height to be as close to the string as possible (without it touching the string when you fret the highest note on the neck).
4. Strings: Newer strings are generally brighter because there is no rust/grime that muffles the higher frequencies. Another option is cleaning up the strings, though this is not as effective as fresh ones.
-- My current rig
Guitar: '98 MIJ Ibanez RG520 QS w EMG 81/60
Amp: Laney LC15R Tube, Fernandes 20W SS
Pedals: MI Audio Tube Zone Overdrive, Boss OD3, CS3, MT2, HM2, DS2, CE5, DD7, TU3, Beta Aivin DD2 Delay, Dunlop Crybaby 95Q, Stranger Vol Pedal, BBE SupaCharger
Others: Yamaha RBX 374 Bass, Yamaha MM-6 Synth, M-Audio Fast Track, Shure SM-57, Heet Sound E-Bow Plus
Wanted(pm if selling): EB VPJr/Boss FV500L,Ibanez w Original/Lo-Pro Edge