My speedo does not come up to speed with the car and when it does come around to pointing out that I am no longer sitting at a light it seems to be reading slow i.e. the speed in MPH matches what is displayed in the KPH reading.
This is just a coincidence I'm sure but is this a cable issue or a speedo issue? Is the cable hard to replace?

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique