Wiring AEM Pressure Gauges - Analog Inputs

[jgauth4468]

I am prepping to wire AEM pressure gauges into the s300 for datalogging purposes. I'm using AEM 30-4401 Fluid Pressure gauges, 0-100psi, for Oil and Fuel Pressure. I have included the AEM connection diagram and the s300 Analog Pressure Diagram.

I have a switched fuse block, which the gauge is wired to, for both the power and ground. I plan to use weather-pack connector, and wire the 0-5v white output from the gauges to the analog 0 and analog 1 inputs. I do not see any reason to utilize the analog ground, am I incorrect in this? Again, the fuse block is switch power & the chassis ground for the gauges already.

[Spunkster]

The gauge does not have a 5v ground according to the diagram. Do not connect a 12v ground to the s300.

[jgauth4468]

Thanks for the feedback. Went ahead and wired up as expected.

One follow on question regarding units for my gauge display. the AEM gauge is a liner gauge 0.5-4.5v (called AEM) for 0-100 PSI. In the analog inputs I've set it up as "custom" with the corresponding voltage & value. Is there any work around to get my Display to show PSI and not bar? Maybe use a gauge instead of a Value? However, I assume for datalogging it will still be in units of bar?

I appreciate any help on this.

[Spunkster]

If you are using custom, you have the option to choose the pressure units on the analog input settings.