How Do I route the Engine Tach wire?

Always route the tachometer wire away from any ignition and/or spark plug wires. A common problem is tachometer wire routing. If a tachometer wire is not routed correctly it can cause a “Dirty Tach Signal. If a tachometer wire is routed under the hood to a coil or injector wire and the wire is routed adjacent to or wire tied to a spark plug wire or ignition harness it can radiate interference that makes the tach signal hard to read. It can also cause a rough idle or miss fire condition.