First of all I agree with Chuck, don't cheap on gauges! You will only save a few hundred bucks to go cheap so DON'T DO IT!
I looked at both the PLX and Zeitronixs because I was trying to run my entire setup with one gauge.
Zeitronixs limits to two readings but will provide an audio alarm for anything else it monitors to tell you to pull your foot out of it. I was going to run AFR and Boost with it and monitor oil temperature on the audit alarm. You couldn't get both oil pressure and temp.
PLX is nice because you can get the gauge that will monitor four items at once and if you plug into the OBDII it'll pull some stuff from the ECU that you can monitor. The draw backs were that you had to hook up, power and find space for five different 2"x3" modules if you were monitoring four items (the gauge module and one each for what you are monitoring), also a member on the forum was using them and he told me that at times the screen would freeze and the only way to correct it was to turn car on and off. Having four on screen still didn't allow me to monitor everything I wanted, which is AFR/Boost/Oil Temp&Press/Water Temp. I also recall that there were preset ways you could have the four gauge screen configure and it didn't allow the options I wanted on screen.
In the end I became comfortable with the fact that I needed more than one gauge. Ultimately I decided on Innovate for AFR and the GReddy Multi-gauge for Boost/Oil Press&Temp. I am also plugging water temp into the GReddy but will only monitor it every once in awhile to see what temps I'm getting while beating on it on hot days.
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