Mounted on top of the steering column, on the left is a Boost gauge, it monitors the amount of boost the Turbo-Charger is producing at any given time.  On the right is a Pyrometer, it registers the exhaust temperature before it enters the Turbo-Charger.  The probe for the Pyro is mounted pre-turbo and at a place in the exhaust manifold where it will measure the hottest exhaust gases.