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We do support this nifty "Scaler" tool for your Modbus Tags. For example in this image, the "raw" value coming in was 0-4045 and I changed that to 0-10 for my tag/gadget. Outputs should work too, though I've not yet tried them myself w/that scaler.
If you're using an Opto 22 controller, you can scale the value when you're configuring that your point in you strategy.
What type of device are you connecting to? Can you use one of these options?