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Just went to the ISSPRO site; went to pyrometers, then to installation, selected R605. The wiring diagram shows two leads (positive and negative) from the thermocouple to the gauge and no other wires... and no 12vdc feed. www.isspro.com/installation/IS119revC.pdf Might need 12 volts for a...

Never seen an EGT gauge that has a dc voltage requirement. The thermocouple supplies the voltage to operate the EGT gauge on all the equipment we have. The only thing the electrical system voltage needs to drive is the gauge illumination. If that's your situation, then just swap out the bulb...