I got the pyro, boost and trans temp gauges. I didn't think much of the instructions from dfuser.com. It was kinda confusing about the wiring. The way I figured it out, You hook all 3 bulbs together. 3 positives and 3 negatives. 3 positives hooked to one single hot wire and 3 negatives to one single ground. Ground was on the frame and the hot was hooked to the lights. Now when I turn on the lights, the gauges light up. Fantastic.

Now the hard part. The boost gauge has nothing but a tube. Can't screw that one up. The tranny has a ground, positive and a sender while the pyro has 2 sensor and a ground and positive. I hooked the both positives together and the 2 negatives together. Positives were soldered to one single wire which was spliced into a "Hot in Run" wire and the 2 negatives were soldered to a wire leading to another ground.

Here comes the problem. Ambient temp was 40 deg. I drove the truck around for a while. The gauge has markings. Autometer phantom gauges. You start at 100, etc, etc. Well, I barely got the temp to go to what I think is 125 deg. I haven't got the pyrometer hooked up yet since I haven't drilled the hole in the manifold. However, I hooked up the pyrometer to the gauge wires and heated it up and you can see the temp rise.

Problems are:
1. Why does it stay at 100 deg even at room temp? Is that normal?

2. What should the temp sensor for the trans be reading?

3. Most Importantly, did I hook it up right? 2 positives to 1 positive wire and tapped into a "Hot in Run" 12V positive source with the ground hooked up the same way?

TIA

 

as long as u have some movement with the trans temp you probable hooked it up right. i knwo when i did mine it stayed at 100 for atleast 20 mins then started to slowly climb. your tranny temp should read about 75 degrees above the outside temp.

 

75 above 40 makes it about 115 which was where it is. I thought I was supposed to hit 160

 

if u hit 160 and its 40 out you might have a problem unless your hauling some serious weight

 

Well, with that in mind. I can sleep better tonight instead of wondering what went wrong with my install.

So why does they pyro read 100 deg inspite of it being 40?

Does the wiring sound right to you for the 2 positives into a 12V source? I think so but if that is how you hooked it up them I must have done something right.

Thanx Officerdangle

 

Like stated, it sounds like your trans temp is working ok. You won't see the temps rise until it gets hot out or you're hauling a load.

The pyro guages are calibrated at the factory, but there is most likely some error involved. If you were reading the 100* while the engine was running, it was probably picking up some ambient heat from the engine. If not, I wouldn't worry about it too much. Given the tolerances and variances in manufacturing, the gauge could be off by as much as +/- 75 degrees.

The wiring is fine. You're ok to have them all feeding off of one common power and ground wire. Think about the connections at the battery. There's one line coming off the battery, going to a fuse box, where the power is distributed. Can you imagine the mess if everything that needed 12V power was wired directly to the battery?

 

OK. Just paranoia because this is the first diesel truck I have had and it is a Ford while I have been used to GMs.

I was reading 100-150 with the EGT laying on the hood of the cold engine.

Now that you put it that way, I suppose I should have thought of it myself. I just know that there is a difference between connecting circuits in series and parallel. Just forgot which is which.

Thanx to all, I can sleep well tonite. Tomorrow, someone will help me install the pyrometer in the manifold.