Erratic EGT gauge

[Mindbndr]

I have a set of Isspro gauges and the EGT gauge has started jumping around over the past couple of weeks. Under normal freeway cruising bounces around between 0 to 700 degrees. My EGT gauge moves around more than my boost. The guages are only about 3 months old and I checked all the connections and they seem tight. Any Ideas other than a defective guage? The boost and transmission gauge work great.

Thanks

 

[SNoyes]

Sounds like a defective amplifier... I have a set of ISSPROs w/ no problems...

 

[Mindbndr]

I know of a lot of people that have issprp and they are trouble free. I guess even the best of manufacturers can have a defective one though.

 

[SNoyes]

Yep, let me know if that was indeed the problem. .

 

[Mindbndr]

Thanks for the help. I will let you know what I find.

 

[Slow Six]

My westach started goofy readings and than quit. It turned out to be a faulty probe. I put in a new one and all was well.

 

[LSchulz]

I would bet it's the amplifier as well. I've noticed something interesting on my bus the past few days that I think is related. I have a bunch of Isspro gauges on it, including a fuel temperature gauge. I have a UHF Motorola, and when I key the mic on it, the needle on the temp gauge jumps all over the place. The second I release it, the gauge goes back to normal. It must be something about the radio frequency that interferes with the amplifier on the gauge.

 

[Matt S]

I've noticed a similar problem with my EGT gauge. It isn't as drastic as 0 to 700* but it seems to jump around maybe 50*-75* at times. I hope it doesn't quit. I'm towing in Colorado at the moment.