Conditions are:
(A) All truly penitent priests who, on any day, devotedly pray Lauds or Vespers before the Blessed Sacrament exposed to public adoration or in the tabernacle, and ... offer themselves with a ready and generous heart for the celebration of the Sacraments, especially the Sacrament of Penance, will be granted Plenary Indulgence, which they can also apply to their deceased confreres, if in accordance with current norms they take Sacramental Confession and the Eucharist and pray in accordance with the intentions of the Supreme Pontiff. Priests are furthermore granted Partial Indulgence, also applicable to deceased confreres, every time they devotedly recite the prayers duly approved to lead a saintly life and to carry out the duties entrusted to them.
(B) All truly penitent Christian faithful who, in church or oratory, devotedly attend Holy Mass and offer prayers to Jesus Christ, supreme and eternal Priest, for the priests of the Church, or perform any good work to sanctify and mould them to His Heart, are granted Plenary Indulgence, on the condition that they have expiated their sins through Sacramental Confession and prayed in accordance with the intentions of the Supreme Pontiff. This may be done on the opening and closing days of the Year of Priests, on the 150th anniversary of the death of St. Jean Marie Vianney, on the first Thursday of the month, or on any other day established by the ordinaries of particular places for the good of the faithful.
...
Partial Indulgence is offered to all faithful each time they pray five Our Father, Ave Maria and Gloria Patri, or any other duly approved prayer "in honour of the Sacred Heart of Jesus, to ask that priests maintain purity and sanctity of life".
As found in the VIS release of the Decree (PENT/DECREE INDULGENCES/... VIS 090512 (540))