Actually no, the IVR does not put out 5v. It puts out a pulsed 12V that is 12v for about 17-18% of the time and 0 volts for the rest of the time. It causes the thermal power in a resistive gauge circuits to be the same that a steady 5v source would cause..... and since these are thermal gauges, that is what counts. A circuit like Tim references will generate a steady 5 volts. The RTE limiter actually simulates the old style IVR, with a pulsed 12v output.
