EGT difference

[Diesel Addict]

I just installed my EGT probe for my SCT Livewire and hooked up a set of autometer phantom II A-pillar gauges (EGT, Boost, Oil pressure, and fuel pressure) this past weekend. I fired the truck up and noticed at idle the EGT degrees were different, sct was reading around 250-280 and the autometer was reading 300-320. i took it down the road and at 45mph in 6th gear just cruising the sct was reading around 450 and the autometer was reading up to 700. I got on the throttle and the sct went up to 550-600 but my autometer gauge got to 1000. I was running Erics aggressive street tune during this. Is this normal or is something wrong (with the install or the truck)? The sct probe is in the back elbow of the driverside manifold and the autometer probe is in the pass. side manifold and the back elbow. I don't know which gauge to trust and how to fix the one thats reading weird. Sorry for the long post just trying to get all the info out I can.

Thanks

[worldwide73]

Don't know how hard it would be, but can you swith them and see if the difference is the same or changes?

[Aronda1125]

I would say the Autometer gauge is reading pretty accurate. I see roughly the same EGT's w/ mine. The SCT reading seems a little low, not sure why. Swapping the probes should let you know if the the SCT is not functioning properly, or if the 2 manifolds are putting out different temps.

[Diesel Addict]

I can't swap the probes. I can put the autometer probe in the driver side manifold. But the wire for the sct probe is too short to go to the pass. side manifold. I an try to swap the one though. Haven't thought of that.

Thanks

[MWilbur516]

Subscribed. Was just about to order the Livewire EGT probe, but I think I'll wait to see how this turns out.

[colo_dually]

I'd trust the Autometer probe, that's about what I'm seeing with my truck. Swapping the probes will tell ya if the SCT or its sender is bad. If that's the case, I'd say call SCT and see if they can help identify if its the probe itself (continuity, and resistance checks) or your livewire unit itself.

[Diesel Addict]

I contacted SCT about this and all they had to say was maybe the probe was not installed far enough into the manifold. So I won't have time to mess with it till saturday, work has been busy, but I will try to mess with it and see what i can find out.

[MWilbur516]

I just installed my SCT EGT probe and my temp readings are comparable to your Autometer readings. BTW, I am running Vivians Looney Tune.

[dhanna6powerstroke]

I run 2 EGT gauges and there is about a 50° difference between the them. The driver's side runs hotter on a Power Stroke, that is why it is suggested to install the probe on that side.