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Will EGT Gauge Drain My Battery?

1471 Views 3 Replies 2 Participants Last post by  chuckster57
I just hooked up my boost and pyrometer gauges from Autometer. The EGT had 3 wires - ground, 12V constant, 12V on/off...the 12V constant runs the actual gauge/probe I assume. Will this constant 12V kill my battery? I turned my truck off and my EGT gauge was still registering 250. Hopefully someone replies soon or I may have a dead truck in the mornin! lol
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I have Autometer Ford Factory Match gauges. The boost is mechanical but the EGT is electric sweep. I used an "Add-a-Circuit" (fusebox double plug) on a fuse spot that registered 12V while the key was off.
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