Setting valve lash

I saw that Fishy, but what am I using as a gauge for the 90 rotation? The harmonic balancer?

And is this for zero lash?

Thanks for the help guys!
Wes

Yeah I use the marks on the balancer. I'm not sure all of them have marks like mine that has them every 90 degrees though. If yours has them that'll work fine. If yours don't have marks every 90 degrees you can measure it out with a cloth tape measure into 1/4ths starting at tdc. You can set the lash to what ever you want. Zero for hydraulics or whatever for solids. It don't matter if it's a hyd. or solid you set them the same. Just the lash spec is different.