So if I am understanding this right it has nothing to do with walking in front of the tabernacle but more so that the Eucharist is present there and one should therefore genuflect. How about making the sign of the cross while genuflecting. Is this required immediately? The reason I ask is if one is going to bless themselves with the holy water walking out of church would genuflecting and then making a delayed sign of the cross with the holy water after be sufficient?
That’s correct - you are not paying reverence to the tabernacle itself, although the tabernacle and the red sanctuary lamp are signs that Jesus is present there. It is what’s in the tabernacle that counts! I don’t think that crossing oneself while genuflecting is required, although I know some people do it - but I suspect that it’s just an extra act of piety to further show that you are acknowledging Christ’s presence. I don’t really follow what you’re asking about genuflecting and then blessing yourself with holy water - do you mean genuflecting when you reach the holy-water font? If so, I would say no, since by that stage you could be outside the church. Whatever you mean, I don’t think there is any need or specific reason why you should link genuflecting and blessing yourself with holy water - they’re two separate acts.
www.newadvent.org puts the rules for genuflection very succintly:
“1. All genuflect (bending both knees) when adoring the Blessed Sacrament unveiled, as at Expositions.
2. All genuflect (bending the right knee only) when doing reverence to the Blessed Sacrament, enclosed in the Tabernacle, or lying upon the corporal during the Mass. Mass-servers are not to genuflect, save when the Blessed Sacrament is at the altar where Mass is being said (cf. Wapelhorst, infra). The same honour is paid to a relic of the True Cross when exposed for public veneration.
3. The clergy in liturgical functions genuflect on one knee to the cross over the high altar, and likewise in passing before the bishop of the diocese when he presides at a ceremony. From these genuflexions, however, an officiating priest, as also all prelates, canons, etc., are dispensed, bowing of the head and shoulders being substituted for the genuflexion.
4. On Good Friday, after the ceremony of the Adoration of the Cross, and until Holy Saturday, all, clergy and laity alike, genuflect in passing before the unveiled cross upon the high altar.”