I had a similar problem with my Bis before. I used to put it down to lack of use, so installed a battery isolator. DEspite the isolator, the indicators seem to slow down almost to a halt up until I rev the engine. Took the car for a service and the mechanic suggested that perhaps the battery needed a good charging. If the problem continues after the charge, the battery needs replacing. To cut the story short, after the battery was charged up, the problem dissappeared! That was over a year ago!