The Handbook of Indulgences has this:
22. Look down upon me, good and gentle Jesus (En ego, o bone et dulcissime Iesu)
Look down upon me, good and gentle Jesus, while before your face I humbly kneel, and with burning soul pray and beseech you to fix deep in my heart lively sentiments of faith, hope and charity, true contrition for my sins, and a firm purpose of amendment, while I contemplate with great love and tender pity your five wounds, pondering over them within me, calling to mind the words which David, your prophet, said of you, my good Jesus: “They have pierced my hands and my feet; they have numbered all my bones” (Ps 21, 17-18).
A plenary indulgence is granted on each Friday of Lent and Passiontide to the faithful, who after Communion piously recite the above prayer before an image of Christ crucified; on other days of the year the indulgence is partial.
En ego o bone et dulcissime Iesu, ante conspectum tuum genibus me provolvo, ac maximo animi ardore te oro atque obtestor, ut meum in cor vividos fidei, spei et caritatis sensus, atque veram peccatorum meorum paenitentiam, eaque emendandi firmissimam voluntatem velis imprimere; dum magno animi affectu et dolore tua quinque vulnera mecum ipse considero ac mente contemplor, illud prae oculis habens, quod iam in ore ponebat tuo1 David propheta de te, o bone Iesu: Foderunt manus meas et pedes meos: dinumeraverunt omnia ossa mea. Amen.
In a more traditional translation:
Behold, o good and most sweet Jesus, I fall upon my knees before Thee, and with most fervent desire beg and beseech Thee that Thou wouldst impress upon my heart a lively sense of faith, hope and charity, true repentance for my sins, and a firm resolve to make amends. And with deep affection and grief, I reflect upon Thy five wounds, having before my eyes that which Thy prophet David spoke about Thee, o good Jesus: “They have pierced my hands and feet, they have counted all my bones.” Amen.
Reverend Fathers, this prayer is usually included in breviaries. If it isn’t in yours, print it out and keep it in your breviary or post it in your sacristy to pray after Mass. Get the indulgence. It’s a lazy curve right over the plate.