Here is a higher res photo of the instrument. If you right click on the image, and select view image you can zoom in.

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Regarding the tach, I've looked at this car a couple of times in the last few years, once at Hershey and once at the owner's garage. I'm not saying it was done at the factory, but it is definitely a tachometer and it does not look like it started life as a speedo. It looks like a real Waltham gauge too.

Here is a picture of the drive.

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I'm a little late to this thread but figured I would throw my two cents in. Anybody buying (or selling) a Darrin needs to have the history back as far as possible. There were a number of cowl casting done in the 1980s and those cowls are now part of complete cars.

Secondly, the body number is stamped in about 10 places and is unique to the car. I would make sure it is in a number of those spots.

Finally, a 120 Darrin is a cool car, but don't be paying 180 prices for a 120. The subject of this thread is the 4 door, which I would assume was 180.