Hello.
In general you don't need to change the firmware because the devices are shipped with the latest firmware and ready to plug in.
Anyway it seems that the rev burner and GI Max are detected by SImDash, so the firmwares should be OK at this point.
I think you can solve the problem of getting over 6000 rpm and the 1000 rpm offset just configuring the rev burner properly, in the configuration screen.
What tachometer are you using? I am asking because the tachometer must be set to work with 4, 6 or 8 cylinders. DO you know how your tachomneter is configured? Ideally you want 4 cylinders...
First off thank you Cristiano for your help and a wonderful product. I am not sure if it was a problem with any USB on my computer but when I plugged in the GI Max, Windows said drivers failed to install (Windows 7 64) Then after I sorted that, in SimDash it said GI Max was not connected and required a firmware version 2 update, the same thing for the Rev Burner. This was connected directly to my computer BTW. After I re-flashed the firmware it then worked, is it possible as it came through Canada Customs they zapped it with their Rayon X-ray Gun?

The tachometer I have is the
Auto Meter 6858. The manual is
Here The only thing I can see in the manual is it ships set at 4PPR. For iRacing I drove the 8 cylinder Ford GT, in the Rev Burner configuration screen I tried testing each PPM and it seemed I could not reach the RPM that was required. I tried importing various profiles. For the 8 cylinder there were only an 8000 RPM, I also set the max value to 11,000 RPM. The RPM on the on screen Tach did not match my Tach, mine was at least 1000 RPM below.
Then with the Lotus 79 which has an 8 cylinder and red line's at 11,000 RPM, I can get my Tach to around 8,000 RPM. Also I do not know how to set the shift indicator light. On Friday I had zero knowledge with the Rev Burner or a Tach, today I feel much more confident but I need to learn more about my Tach.
thank you
Darren