This is simply an awesome bit of kit. Part number 19202 is the actual gauge. It's very light and thin but quite large requiring a 60mm diameter hole. The best part of the gauge is the fact that it's electronic not mechanical. A separate control box (Part number 19200) is required. This connects to the engine via a thin tube and measures the boost electronically. The signal is sent to the gauge via a lead. The control box can actually measure other readings including oil pressure, oil temperature, fuel pressure and water temperature. However these would require extra gauges to display the readings. The control box needs to be wired into a switched power supply.
When the gauge is switched on the needle does a diagnostic full sweep of the gauge in fine and course movements. Then it jumps to the overboost warning position finally jumping back to exactly 0.
There are three buttons on the top of the gauge labelled record, mode and peak. Pressing the peak button causes the needle to move to the maximum boost achieved since it was last reset (by holding down the peak button).
Press the mode button to set the delay between the maximum boost reading and when the needle drops back, this can be instant, one second or two seconds.
The record button when pressed for 3 seconds starts recording the next 99 seconds of needle movement. The red light will start flashing to indicate that recording is taking place. Press the button again to stop recording. To play back the recording press the button for over three seconds until the gree light comes on. The mode button can then be used to adjust the playback speed.
If the mode button is held down the overboost warning can be set. Use the record and peak buttons to move the needle up and down the gauge until the desired level is reached. If this level is achieved whilst driving the red light will come on as a warning.
The needle is very swift to respond and appears to be very accurate. The boost level warning and any recorded movements are saved even when disconnected from the power supply. In fact the only downside I can see is that there is no control over the lighting. It's on all the time (a white light) and it can't be dimmed.
To connect the boost hose to the engine remove the windscreen wipers and the skuttle panel behind them. Loosen the bolts holding on the wiper mechanism and move it to the LHS of the skuttle panel. On the RHS there are two grommets protecting the bonnet release cable (top right) and the rear washer hose (bottom left). The best one to use is the rear washer hose grommet. You will have to cut around it with a knife to remove the sealant. If you push the hose through from the engine side you should be able to locate it down the RHS of the interior behind the dashboard. You might find it easier to drop down the fuse holder whilst doing this.