After full recharge and a full day after still pluged. I fitted the battery in the Elise and started the car.
No more problem with the dashboard cluster.
Rode the car for more than 200km and all ok.
I would guess that in my case the problem was the droped of battery charge.
This is my report about this time issue.
Thank you guys.
I have 2009 Elise 111R (almost 8000km total).. and after 4 week "resting".. (I was on holidays)
The cluster went "mad".. always reseting, off and on, needles move on "check", All cluster lights on then off, no distance counting (not bad for total counting mileage...ehheheheheh), the worse... no Fuel gauge working properly, always "full" when lit on.
Work in progress.
I put the battery off and charging with a CTEK battery charger from last night (complete charge).
The battery is off the charger now and on hold.
I will then fit it back in the car.