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The challenge in a small space is that as the number of air changes increases the efficiency drops. Balancing the air exchange rate is important, though as long as you heater/cooler can maintain comfort the only 'problem' I see is a reduction in the energy savings—

As I recall 'A' is ground, 'B' is power. I clipped the red wire on one of the "Y" connectors and attached to 12v feed. The Bluefire adaptor hasn't burned yet—

1— I agree. As yet I have not taken the time to learn the backend of the Bluefire software; 2— We have a 3126b, no idea what Bluefire sees from the C7, @Third From Texas has a Bluefire adaptor The RV OEM apparently wired the oil pressure sensor to feed the J1939 system. According to the CAT...

We have a 9 pin adaptor. Our data port is 24v. We bought a splitter and replaced the 24v feed wire on one with a 12v feed. Now we have two 9-pin ports at our left knee, a 12v and 24v. I was hoping to use the bluefire to create a glass dash, though our ECU/ECM systems and the bluefire share...

Bluefire makes a 9 pin adaptor and app to read various systems from J1939, J1708 and CANBUS. We have one, though our military systems offer more a teaser of information than enough to build a glass dash. You have to convert or add a 12v connector to the connector at your left knee to use the...

I agree CAT's suggestion surprised me, too. Though that is a quote from their spec sheet for 'balanced performance and fuel efficiency'. Attached sheet to post #17. Our M1078A1 with the 330hp tuned 3126b doesn't like 7th gear at 60mph. We have to go faster than we wish to get into 7th, then...

As @GeneralDisorder does, I *assume* the M939A2 CTIS ECU will plug and play in the LMTV A0 variants. Easy enough to check. Use the M939A2 CTIS schematic from post#65 and match to your A0 schematic?

Does the AOP use special hydraulic oil, like aviation hydraulic?

My two cents: For balanced performance and fuel efficiency 3126B 330 hp 3.90 gears and eco hubs 85psi tires spin 2000rpm at 60mph in 5th gear CAT suggests: 2000 rpm @ 60 mph (97 km/h) subject to the following: Maximum cruise speed of 65 mph (105 km/h) or below. Maximum recommended engine speed...

Looking at our crawl-ratio sheet showing standard 2:1 wheel hubs, EcoHubs, 3.90's and 3.07's at rpm's for 1440 (peak torque), 2000 (suggested 60mph), and 2400 (suggested max) rpm's: 3.90's hit CAT's suggested "best balance of performance and fuel economy" in 5th gear. Thank you @Xengineguy...

CAT 3126b spec sheet states: For the best balance of performance and fuel economy, spec axle ratios and tire sizes to obtain: 2000 rpm @ 60 mph (97 km/h) subject to the following: Maximum cruise speed of 65 mph (105 km/h) or below. Maximum recommended engine speed at cruise — 2400 rpm. Minimum...

@Suprman likely has the right CTIS controller for your unit and more important: will tell you if he doesn't and confirm a unit he has is not 5 solid. Using a 900 series is not a big deal, you just have to pull pins on the controller to isolate the J1939 circuit from it. There are several...

@GeneralDisorder is correct: 3.90 is closer to ideal with EcoHubs. 4.50's (or 4.44's) would be awesome on these rigs. Seventh gear would show up on the flats. We have no experience with the 3.07's. On and off road so far we like the way our truck reacts with 3.90's and EcoHubs—

@Plasa units are really nice. And the circuit board does all the thinking. I have been looking at how to incorporate the data and push button face into the dash/central console and stashing the rest of the innards with the PCU behind the foot kick—

Something like SendCutSend? There is another one, too that folks here like—

Repainted the dash as part of stripping the cab to insulate, build out consoles, storage, carpet and paint the interior. While putting the dash back together tested if we could move the lights to the outside and transmission to the inside, though the light switch wiring is too short. Still...

Sounds like the resistor in the J1939 circuit burned up, it lives under the PDP, there is another in the engine compartment near the engine ECM. We replaced our dead ECU with one from a M939. These CTIS ECU's conflict with those on the LMTV. Or it did on ours, burned up R12 and R13 until we...

Awesome, it looks intriguing. Keep the pictures coming. We are very visual—

We have the laptop you made us and know I have barely scratched the surface on what you installed for us—

I hope to be as good as you one day at finding the real parts. Do you offer a class Rick?