Tach Filter Question

[csfields]

I know this has been burnt up on other threads. I am still not finding what I am looking for. I am installed a factory tach, which was obviously junk, didn't know it at the time, so I purchased a new repo tach from Classic Parts and stated that I had to use a tach filter. I have read threads where some say it's needed etc. I figured since they recommended it wither for functional purposes or for a sale, I would use it. I just need the sime question of how to hook it up exactly. The tach like a factory one has the 12+ and coil terminals on the back along with a added ground post. I am just curious as to the proper way to get the filter inline with all this. Not quite sure I understand the directions. Call me stupid, just need some direction. I have managed to build this truck from the ground up, but stumped here.

I pulled pictures from other posts to show filter and directions.