Hi, my name is Juan and i'm in Tucson AZ. I'm new to this site, so I hope i'm doing this right. My question is I purchased a 2018 Ram 3500 with a 6.7 cummins diesel, I got it because I purchased a 2021 38ft travel trailer and I needed the right truck for this job. My question is I changed the original fuel tank to a 50 gal tank. Ive talked to the local dealer about any changes I have to make in order to get the right readings. Apparently they dodn't have any answers, so my question i'm asking is has anyone done this to their truck and what was done? Thank you
AlfaOBD will allow you to set the tank capacity in litres and there other tank tweaks available for calibration. 3.78 litres/gallon
Any truck 2018+ will also require a security gateway bypass harness. Many users here prefer the KaodTech harness for build quality, reliability, and ease of installation.
Also, you can leave the KaodTech harness installed (tucked up under the dash) and the stealership can still have access to the OBD port. Mine has never been removed since I installed it last year.
kaodtech.com
Many users will use AlfaOBD with an Android phone or tablet while I prefer a Windows laptop. I worked most of my career in Telecom and don't trust Android with anything important, YMMV.
You will also need an interface to connect to the OBD port. I use an OBDlink SX because they're much cheaper, faster, and more reliable than most Bluetooth-type interfaces.
$50 for an OBDlink SX instead of $140 for the popular OBDlink MX+ Bluetooth interface.
https://www.amazon.com/ScanTool-OBD...=se&keywords=obdlink+sx&qid=1720621738&sr=8-1
And,
to Ram Forum.
.