Low voltage reading when using Pirani pressure gauge

I am trying to get a voltage reading using Pirani pressure gauge using a NI data aquisition device but when I am testing it at atmospheric pressure, the reading is supposed to come out at around 10V and I am only getting about 2.7V. I used pins 3 and 5 to get the voltage reading and according to everything I've been seeing this is the proper way to do it. Anyone know where I am going wrong?

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