Alright, so I'm at a loss here. Well, maybe not entirely. I have a theory! :smart:So, the other day I was coming home from work and noticed the EGT gauge was reading abnormally low. Like less than 200 while driving. I knew something was funky. But, I also shrugged it off after as I figured maybe it was from decelerating.Well, last night I was driving again and I could not get the temp to read higher than 250. WTF! :banghead:I replaced the thermocouple 2 summers ago! Even made a thread about it! Have not touched it since than and cannot even begin to think what could be doing it. The gauge, maybe?Then I tested my theory. I got on the freeway to go to my destination, goosed it! Did not have to go very far though... Got nothing! Hmm...Okay, so after, I head back home. Then it starts working fine again and reading what I would believe to be the right temps. :mad:What the heck? What gives? It worries me a little as I wonder if I'am even showing the right temps, now? My theory was that since I have been doing alot of short driving to and from work that it has a buildup of soot. So I thought that if I goosed it on the freeway, I could burn it off and the probe could read accurately again. This is assuming soot is a type of insulator?Other then that, I've got nothing. I have no idea why its doing what its doing. Is it time for a new gauge? Its a dipricol...

What kind of gauge?All connections good? Make sure the harness is plugged in good at the gauge and the thermocouple. Maybe use a little dielectric grease?

Well then, pull the thermocouple and see what it looks like. However, if you are building that much soot something is really wrong.......

I know this is a long shot but hook a ground to the thermocouple and see if that helps, might be loosing a ground in your wiring.

Yea, I'm gonna have to look it over. I drove it again today and its acting up again. It only worked momentarily and then now its all screwy. Heck I was running at 150 degrees on the way home!

Sounds like the gauge itself is bad if the pyrometer probe and wiring is good.

Alright fellas, I took a look at the gauge and probe a while back. Pulled up a chart and tested the probe. Put a flame to the probe, looked at the EGT gauge and measured voltage. Voltage showed that it correlated to be within 25 degrees of actual temp. I burnt the soot off the probe and it was fine until about a week ago. Thankfully I think it worked fine pulling the trailer home.Did not want to get caught with my pants down so I broke down and shelled out the cash for a new EGT gauge. Got another Isspro ev2. Even though it is not the prized dipricol gauge that everyone has loved, it is refreshing to have!Much brighter than the dipricol and ALOT more sensitive to the temps. It kind of scares me a little as I may have been pushing the truck more than I thought... I dunno how hard though as it seems to run fine. I know my mileage has taken a dive, but if that is the only thing, then you would not think piston rings or the like, right?I had the comp on 5x5 and let her rip! When I hit OD I think, it will just take off from under you! But there is a spike in EGT's to about 1300 degrees momentarily. I never seen that with the old dipricol!Anyways, I think eventually the fuel and boost gauge will be next! I just wish they could be mechanical instead of electrical senders...

You can get mechanical fuel pressure and boost gauges! For fuel gauges a quick search on Google gave me about 1,480,000 pages and a boost gauge about 3,290,000 pages.

I have mechanical oil pressure, fuel pressure, and boost gauges, all Isspro. I think DAP sells them. I got them through work but you should be able to find them other places. That way you can still have the Isspro's but all mechanical.

You can get mechanical fuel pressure and boost gauges! For fuel gauges a quick search on Google gave me about 1,480,000 pages and a boost gauge about 3,290,000 pages.

<-- Smart@$$! Hmm, I'll look into it more. I coulda sworn I did not see any Ev2 mechanicals...

<-- Smart@$$!

I know, "Everybody likes a little @$$, but nobody likes a Smart @$$!!":lmao2:

Good ol' Tom stirring the pot.

Good ol' Tom stirring the pot.

What...... Who me??

EV2 mechanical gauges are supposed to be released sometime soon, but I don't know when...

EV2 mechanical gauges are supposed to be released sometime soon, but I don't know when...

Looks like the only one I should be worried about is the fuel pressure. The others are "mechanical" for the most part.

Right now, the EV2's are an electronic gauge only...which is why you can't find them in a mechanical gauge setup...wish they were mechanical...I shoulda looked closer at that when I bought mine... Oh well, when they go out, I'll get mechanicals...