78 blaser tach cluster into my 86?

[Telecasterjoey]

So I just picked up a working tach cluster for my truck. My truck is out for paint again and I'm dieing to know if the tach cluster will just plug in and work?
I know I've gotta hook up the tach to the coil, 12v, and ground but other than that is that all there is to it? My truck came stock with no clock or tach just the normal simple cluster.

I searched and couldnt find a definite answer. Thanks!!! oh and here's a pic!