Chaotic Pryometer

Thanks Daniel for the correction in reading that. I figured it was read in Ohms, but that goes to show you what I know.
Well, before it started going erratic this was what I was reading: Idle seems to be reading the same but is normal at about 300ºF and sometimes it will go lower recently. Normal hwy speed (70mph) unloaded has run about 600ºF and now it stays about 300ºF to 400ºF. Normal hwy loaded (loaded being pulling the horse trailer pictured in my sig) has always been between 800ºF or 900ºF now it's at about 600ºF and getting on it loaded up a hill it would never get above 1150ºF and now it get's to 900ºF. It's about 300ºF less than what it used to be. It's like I went from pre-turbo to post turbo. I have it mounted pre-turbo. Hope that helps. I'll measure the volts of it when I get home. FYI, the needle on the gauge has just nuts at times, like it was getting voltage spikes or something. Doesn't do it very often but has done it.

Peace,
Todd

Thanks for being a help Dan.
Boost hasn't changed. Came back from a ride in N. central OK last weekend and went through the Arbuckles on I-35 (it's a decent climb for flat landers) and my boost gauge was reading upwards to 20 psi at one point which is about as much as I can get out of my truck (no intercooler) so I don't think I have any leaks. I'll check that out though. At that point though the Pyrometer was reading around the 900ºF mark which it used to be about 1150ºF (has only moved to the 1200ºF mark once that I remember) sooo... I'm going to get another probe and see. My set up has the clamp, not the bung and it's mounted right below the drivers side manifold in the up-pipe.
I was investigating some other posts and I'll go and check my wiring this evening.


Peace,
Todd

Checked out wiring. Still reading the same. I've checked out the exhaust system up and down and can not find evidence of a leak anywhere. I'm guessing that I need to replace the sender/probe as the new gauge I bought seems to read, well, nothing at all. I will say that after messing with the wires it has not gone beserk, reading from one side to the other, like it was on occasion. It' s just reading lower than it has normally. It's almost like someone switched to the post turbo side.

Hey Dan,

Well, I figured it out. Kinda stupid really. I had an old electric oil pressure gauge before I switched to my mechanical one, and I had obviously forgot to take the wire out for the old gauge. Well I guess this wire was tied into the pyro somehow and I was hooking up my airhorns this week, I found that wire wrapped around the underneath of the steering column and shreaded so I guess it was grounding out the pyro. I have since removed the wire and all is well. Told ya it was stupid. Thanks for all your suggestions though. I don't know how I missed it the first time.