The cable should go through the firewall into the engine compartment and then run across and back to approximately under the back of the front passenger seat where it goes into the side of the transmission near the back end of it.

Hopefully someone reading this can post a picture of what I'm talking about.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

Thanks a lot for the help man! Been a huge help!

Just took cluster off and stuck a match stick in the speedo and spun it clockwise and the needle was jumping up above 0mph to like 20mph depending on how rigorously I spun.. Does this narrow it down to being the cable?