I have both a NOMAD guage (40psi) and a SECS monitor. Both seem to tie up with each other.

If you need more than 2 bar don't think about using the boost reading on the SECS as that will only read what the ECU see's from the map sensor.... ie 3 Bar is 2 Bar of maximum boost to read. For this reason I needed to get a NOMAD one which reads over 2 bar.

Even though I rarely use over 2bar, it comes in useful for when I have the need for speed.