Ways to fix broken speed odometer?

2003 Honda Civic Si: thru research I found out it originally came with 15 inch rims, however I bought it with 16's on it. Also it has an 04 RSX tranny 6 speed. AND THE SPEEDOMETER DOES NOT WORK! I'm getting juice to the adapter for the speed sensor, and bought a brand new sensor thinking that was the case. But nope. Still no speedometer?! Any ideas on other ways to trouble shoot the issue?! Suggestions welcomed!

Get a diagram of the electrical system, which shows the speed sensor, the speedometer and the wiring. There's a fuse and electronic module involved. With the diagram and a voltmeter, you can trace the circuit.

See if your city library or local college library has an online subscription to Alldata. That's where I get all my automotive electrical diagrams, and other service information.