Ditto to Roadracer's comment to go easy on the speedo cable oiling. You are really only supposed to use graphite powder and not oil because oil can ultimately cause problems. I doubt a little light oil will hurt though. For future reference if you think you have a problem with the cable you can usually pull out the inner cable (the part that turns) clean it up, rub some graphite on it and slide it back into the outer cable. It helps to twist it a bit as you push it back in, especially for the last inch or so so you will be sure to engage the far end properly.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold