Seems like the panel above the glove box was designed for this. You can remove it very easily by pulling on it. Notice how the back is hollow with TONS of space (normally occupied by the airbag in most cars). Unfortunately, it's to the right a bit far out of view.
Best option is to get rid of the analog speedo like what Gruppe M did with the OEM NSX Volt meter (see below). They replaced it with a boost gauge. In real life though.. the gauge was so small and much too vague to be of any real use.
Lower right use to be a volt gauge. Replaced by Gruppe M to a boost gauge.
