I don't think they made a turbo in 1980.
Mine is not a turbo. As to the layout on the dash I do not have a tach but have the big clock instead. I think this is common for the non-turbo models.

This model and year has the dreaded acc servo.
I do know of at least one guy though that did the conversion to the newer controls and he loves it.

Apparently did not take that much work. When his old servo died he bought a rebuilt control unit and then everything else from a wrecking yard. After cobbling together a couple of new heater tubes for the engine compartment it works great.

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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