G3ood,
Sorry for the delayed follow-up. No worries about the tamper light in reverting back to the stock original ecu. No tamper lights, no issues. If you swap gauge clusters without aligning it with the ews, I think you'd get a tamper light. I reached out to the tuner and verified for us. Hope that helps.

Emory, pics are being released late tonight.

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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name:Doppelschrauben-Kompressor

Wife's Ride: 2011 e70 X5 351 M///Sport.

Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.