On "C" cars with factory fit optional dash configuration, to accommodate the outside or inside/outside thermometer, that hole would be in place on cars that also came with optional Hella 128 fog lights. My car has said dash. Here is a partial picture, showing where the thermometer would have been fitted. I substituted it for a oil pressure gauge.
http://www.abcgt.com/forum/4-356-Forum/13843-356-Cockpits.html?limit=6&start=96#19477
As you can see, the headlight switch is centered in the dash where the clock would normally be installed. To the left of the headlight switch, out of view, the clock resides, so nowhere to fit the fog switch when needed. It went to the left of the ignition switch on cars with both options, just like the hole in question. Dealer installed thermometers were fitted behind the passenger grab handle on the far right of the dash, with the fog switch installed in the normal location, to the right of the clock.
When town/county horns, and rally lights were fitted, things get more interesting. My friend Mike Allen has such a car, with the thermometer mounted at the far right (for monitoring by the co-pilot to check for ice), and additional fog type switches installed to control the horn/rally lights mounted above and to either side of the tachometer, in locations that mimic " B" headlight switch and hand throttle positions. This car was campaigned in the "Tour De Europe" when brand new. I couldn't swear that all of these mods were done at the factory, but most of it appears to have been so.
http://www.abcgt.com/forum/4-356-Forum/13843-356-Cockpits.html?limit=6&start=96#19477
As you can see, the headlight switch is centered in the dash where the clock would normally be installed. To the left of the headlight switch, out of view, the clock resides, so nowhere to fit the fog switch when needed. It went to the left of the ignition switch on cars with both options, just like the hole in question. Dealer installed thermometers were fitted behind the passenger grab handle on the far right of the dash, with the fog switch installed in the normal location, to the right of the clock.
When town/county horns, and rally lights were fitted, things get more interesting. My friend Mike Allen has such a car, with the thermometer mounted at the far right (for monitoring by the co-pilot to check for ice), and additional fog type switches installed to control the horn/rally lights mounted above and to either side of the tachometer, in locations that mimic " B" headlight switch and hand throttle positions. This car was campaigned in the "Tour De Europe" when brand new. I couldn't swear that all of these mods were done at the factory, but most of it appears to have been so.
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