The specialist system monitors the strain from wind, traffic and the weight of the bridge.
Specialists were brought in to install the monitors which will feed data back to the control room.
The bridge was closed to all traffic on 4 December after a crack was discovered in a truss under the carriageway.
Engineers hope to have it repaired and open to traffic again by 4 January.
An inquiry will begin after that, with MSPs agreeing that the "immediate" priority should be to get the bridge reopened.
The lorries were sent over the bridge in different patterns over five hours of tests on Saturday.
An inquiry will focus primarily on the structural defect, and an independent technical adviser will be asked to take part.
The inquiry aims to call officials from bridge operator Amey, its predecessor the Forth Estuary Transport Authority, Transport Scotland staff and Transport Secretary Derek Mackay.

Steve Huffman said that he had not created the news comment platform "to be a bastion of free speech, but rather as a place where open and honest discussion can happen".
He promised to provide further details on Thursday.
One expert said the plan would probably enrage many of the site's users.
Last week, Reddit's previous chief executive, Ellen Pao, resigned after an online petition calling for her dismissal attracted more than 213,000 signatures.
The petition had accused Ms Pao of leading the site into a "new age of censorship" after five "subreddit communities" run by volunteers had been banned for failing to tackle the "harassment of individuals".
However, one of Reddit's other former chief executives - who no longer works for the company - has since suggested that Ms Pao was less minded to restrict users' activities than many of her critics had assumed.
"On at least two separate occasions, the board pressed [Ms Pao] to outright ban all the hate subreddits in a sweeping purge. She resisted," wrote Yishan Wong.
"She probably would have tolerated your existence so long as you didn't cause any problems. I know that her long-term strategies were to find ways to surface and publicise Reddit's good parts - allowing the bad parts to exist but keeping them out of the spotlight."
Reddit attracted more than 163 million visitors last month, according to its own figures, making it one of the net's most popular destinations.
Mr Huffman co-founded Reddit in 2005 and was announced as the site's new chief last week, following Ms Pao's resignation.
In a message posted to the site on Tuesday, he said his top priority was to develop a "comprehensive content policy" and tools to enforce it.
"The overwhelming majority of content on Reddit comes from wonderful, creative, funny, smart, and silly communities. That is what makes Reddit great," he wrote.
"There is also a dark side, communities whose purpose is reprehensible, and we don't have any obligation to support them. And we also believe that some communities currently on the platform should not be here at all.
"We as a community need to decide together what our values are. To that end, I'll be hosting an AMA [Ask Me Anything session] on Thursday."
More than 14,000 comments have been posted below the announcement by the site's users. Some support his action, others suggest it will destroy the community.
Several members said they now intended to switch to Voat - a rival site that promises to "not meddle and not censor content" unless it is illegal.
One analyst said it was inevitable that Mr Huffman's plans would antagonise many of Reddit's users, but added that was not necessarily a bad thing.
"When you try to formalise things that have emerged as an organic mess, there is absolutely a risk that you are going to lose a lot of the core of what you were and alienate a big bunch of users," said Mark Mulligan, from Midia Research.
"But Reddit has had a couple of years of incredibly strong growth in terms of profile and influence, and in many ways this is a good time to take this gamble, because it has momentum.
"If you have momentum, you can afford to lose a sub-segment of a generation of users because you can be confident of attracting a new generation and so can mould the company to better fit the owners' and management team's moral compasses."
Ten lorries have been used during tests of a new state-of-the-art structural monitoring system installed at the Forth Road Bridge for the first time.
[NEXT_CONCEPT]
Reddit's new chief executive has confirmed he plans to take fresh action against parts of the site containing offensive and obscene content.