djlyon

I don't know if I love or hate to say this anymore. It ain't air bubbles, it's vaporized alcohol. It's the result of heat and the fact that the remote needle is integral with the backplate instead of a bolt on. The bolt on is one more thermal junction (barrier). The engine is a 90 in a 60 size case, not good for dissipating heat.

You guys that have had old cars, I mean old, remember the term vapor lock. This is a similar condition.

The above is based on some non scientific experiments that are not conclusive but point to the above being true.