On the CDR 220, there was an input for the speed sensor. This allowed the unit to adjust the volume based on the speed. I don't know whether the 210 had the same feature or whether it will affect the operation if it is not connected. There may also be connections that affect the illumination of the controls on the unit.
Overall, I'd say this is worth a shot. You may want to consider bench testing it before installation using either a computer power supply or a 12-volt battery for your power source. Here's a video that shows you how: https://www.youtube.com/watch?v=QntZ3A4bG4w You should be able to find a used power supply on Craigslist.
Good luck.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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