Using different brands of devices.

I have a question with the PDU or PWM. I'm doing your courses because I'm going to wire up a circuit car and I want to use an AEM PDU-8 with an ECU MASTER can keyboard to manage ON, Ignition and others devices; My question is: Can I use the AEM PDU I already have with the ECU MASTER keyboard?

You're probably going to be best to check both the manufacturers web sites - if it isn't in the compatability list, check the FAQ/support sections.

If there isn't the info' there, then try sending them a direct query.

And it's unlikely they will know. You will need to study the documentation / software to figure it out yourself unless someone on here knows for sure. I've learned these "science" projects often have restrictions not discovered until much later. Best to buy parts you know are compatible. All from one source / manufacturer means they will be motivated to get them working together if you discover an issue.

There will sometimes be compatability lists, but can't find one for either unit. there's a guide for the keyboard configuration - https://drive.google.com/file/d/1UU9b7UOS5scFanTJeNrVqXANE8N8eGfT/view - but if you don't know how to configure or the info' from AEM isn't helpful - https://www.aemelectronics.com/files/pdf/AEMNet%20170116_Public.pdf - it's going to be a massive headache and learning curve.

The easiest thing may be to use a keypad from AEM, but they don't seem to have one - and it only mentions using the Infinity ECU as the input device?

Personally, I agree with David that the best option is to sell the PDU and purchase components from the same manufacturer* that will be sure to work with each other - further, give some thought to any expansion you may be considering in the future to make sure you have an upgrade path that won't mean replacing any purchases again.

*maybe different ones if BOTH/ALL state they are cross compatable?