you want to measure the pressure straight from the tap.
How are you hooking into the freshwater? Did you tap right in or are you using the faucet adapter? To test the pressure in my system, take a piece of the plastic tube the system came with and hook that right to the feed line. You need at least 35psi for the system to work properly.
The TDS meter shouldn't need to be calibrated if the batteries have died. You should be able to get 0ppm with a properly working system.
If the TDS starts going up or is higher than ~5, then I'd start looking to replace the DI resin and filters.
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