Ah ha!!
Pyramid Lake Paiute Tribal PD is listed on RR under the Nevada Shared Radio System, which at least at the Marble Bluff site seems to be identical to the Washoe County EDACS system: they have the same freqs., at any rate. If anyone is interested, the talk groups appear to be:
372 PLPTPD D ispatch
373 PLPTPD Tac 1
374 PLPTPD Tac 2
This remains to be tested. Soon.
It might be helpful to list this agency, the PLPTPD, under the Washoe County EDACS system page in the database, as is the Reno-Sparks Indian Colony.