Does the speedo and tack have chrome rings? Chrome rings means you have the new design.
The older design has "built in" weaknesses. These weaknesses include dropping out and flickering etc. due to bad soldering joints.
I do think you're on the right track because a bad regulator is so often associated with flickering.
Another thing you may already know is having your Volvo rebuilt by a reputable shop is better than a half-baked rebuild from some other supplier.
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