Haha yeah that thing, I removed mine years ago, I bet theres not many of those around these days! By removing the lid, you have effectively removed yours too now
I'm tempted by the meter I must say, £160...whats that? about two dyno runs these days?
£145 on fleabay
http://www.ebay.co.uk/itm/INNOVATE-MTX-L-AFR-Wideband-Air-Fuel-Ratio-Gauge-3844-/300506017816?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item45f78df018