Being SRAMs early 1:1 actuation mechs it will be compatible with any SRAM 1:1 shifter, including grip-shifters and trigger types.
I have tried and tested this recently with some modern X-9 trigger shifters and a 16 year old ESP 9.0 rear mech.
Back in 1997, I upgraded to the early SRAM ESP 9.0 rear mech and 9.0 gripshift on my 95 Zaskar. It was a massive improvement over the Gripshift SRT 800 X-Ray shifters that I had fitted before them.
The 2:1 cable pull ratio was compatible with Shimano mechs but even with super clean and lubricated cables you needed the forearm strength of an arm wrestling champion gorilla to shift gears. You could forget about shifting completely in the wet unless you fitted the 'Shark Tooth' grips.
The ESP system still required reasonably clean cables, but meant you could easily make nice light action shifts. In short it was great.
I had ESP 9.0 on that bike with no issues for about five years, at which point my Zaskar was stolen.
I do now have another 1997 Zaskar frame and a complete ESP 9.0 set up. One day I'll get around to building it all up again.