Personally I would be looking for an existing "black box" to convert your serial data in OT-2 to your analog signal that the DB gauge is looking for... but I'd seriously doubt such a device exists as it's such a unique thing to do.
I'd be talking to the guys at innovate as they're the ones that run the OT-2 protocol and the gauge and if anyone has something to do it they would.
If you're a masochist and want to go back to first principles it's going to require a fair few bits of electronics to pick the rights bits out of the words and reconstruct the digital data, then convert those digital words you've extracted back into an analog signal. Nice little project for some 4th year engineering student if you can find one.
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