I think I've searched every forum but im not sure about which wires I need to connect to make my factory tach work with my lt1 swap. I'm pretty sure about the coil wire I should splice into on the lt1 harness (black & white on the grey side of the coil plug) but I don't no which wire on the cluster harness to tap into. I don't have the original engine harness on the car but I do still have the yellow and white connector on the driver firewall. can I run wires from the coil directly to the back of the tach if I remove the tach? can I run a wire from the yellow and white connector to the lt1 coil? can I run a wire from to the coil to to the cluster harness? if so, which wire? thanks for any help.