Tachometer Help

That's pretty crude way of doing it. I would take a loock at the back side of the fuse block and see if there are any empty connectors that are powered only when the key is on. Then crimp a spade connector to the wire and install it there.

If there isn't there are male spade connectors that are for connecting wires to the front side of the fuse panel, I would track one of those down and use it. Make sure you connecto the side of the fuse that doesn't have power if the fuse is removed. You want that wiring to be protected by the fuse.