[Richard L]

Can you answer the following:
1. Where are you connecting the red wire of the molex connector. Fluctuation of the 12V supply?
2. The serial number of the unit.
3. Are you using the purple wire of the molex connector?
4. Is your circuit board exposed? Condensation?
5. Check the gauge cable is secure.
6. Open up the gauge and check the soldering of the RJ connector
7. Blockage will not cause the gauge to flicker.
8. We have not tested the system with vodka

One remote possibility:
As the water/vodka mixture depressurises at the nozzle tip, it will reduce the temperature further. This may cause the partial freezing at the orifice of the jet and reduce flow. This happens quite often in Canada at this time of the year. This problem can normally be solved by upping the concentration of the methanol ratio. In your case, putting more vodka into the tank. Let me know if it works.