Just to check to see if I'm right or not, the Yellow/green wire that was used for the stock coils, can I use that wire on the direct fire trailing coil to get the tach in the dash to work?

Also, I had to change some gaskets with my turbo setup because the old ones blew out in less than a year. I bought some 3rd gen exhaust manifold gaskets, on the gasket itself, does it matter which way it goes because their are two different sides.