Lifetap interaction

I cant find answer, so i hope someone have it. I have a question about how different levels of lifetap work with each other.

For example we got:
-level 20 lifetap linked with main attack skill
-level 1 lifetap linked with mark skill

level 20 have bigger "more damage" buff, question is bigger level lifetap always override small one or how this interaction works?

thanks in advance

Read the gem carefully. The support gem grants you more damage as long as you have life tap. It's not the life tap buff that gives the damage but the gem.

So in your example you have life tap. Your main skill support is max level and will grant it's more damage multiplier to your main skill while the level 1 life tap gem will grant it's damage buff to the mark skill. But marks don't do damage to begin with so the damage buff is wasted.

No matter what Lifetap you will activate all lifetaps works. So You can have lvl 1 lifetap to activate it and several on high level on different skills to grant them buff.