I have a cluster with gauges and a tach from a v8 that I would like to swap into my car which currently has a 4.3. Will the tach simply bolt into my existing cluster and operate? Will it read accurately? Are there any temporary solutions or do I need to swap the entire cluster over? I also want to get rid of my dummy lights. Can I do this in sections or do I need to do it all at once and will the tach work with the v6 either way?