No, but it implies there was no meter then but there is now.Another of those potential ambiguities of the English language, I suppose. How about ...Some people here obviously use different rules to me for comprehending "before the meter was fitted"...
"I re-painted the object before any rust was present"? That doesn't imply that rust was ever necessarily present, does it?
That "was" implies there is now a meter.In context, if there actually is still no meter, maybe it would have been clearer to say "before a (or 'any') meter was fitted" ?
If there still is no meter then the correct wording would be "before the meter is fitted".