My friend has a 1999 C230 and it does not have the pushbutton unit, no display, just knobs. But I thought I saw someone with a 1999 say that they had the display so maybe some do and some don't. All the 1998 C's have the display...

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra