I just bought an Autometer fuel pressure guage so I could log the fuel pressure but I know some guages use a ground return signal. My question is do I have to input the guages' ground to the EIO plug & if so can i put it in the same slot/cavity that my wideband is in?
99 T/A WS6, original LS1 turbo
the power ground can NOT go to the EIOOriginally Posted by WS6HUMMER
the 0-5 volt ground goes to pin 5 of the EIO
because of how the MPVI was built it allows for a floating ground from the 0-5 volt inputs...
so you can ground the gauges power and its 0-5 volt ground to the same spot and it doesnt need to connect the ground to the EIO...its actually better if you dont so you can avoid a ground loop/voltage offset issue
-Scott -
Thanks glad I asked.
Last edited by WS6HUMMER; 03-23-2009 at 04:09 PM.
99 T/A WS6, original LS1 turbo
What exactly do you need to log fuel pressure? Can you buy just a sending unit? I really have no need for the gauge (monitor a/f via wideband) and no place to put another gauge but I wouldn't mind being able to log FP.
2001 SS - 4L80E - Vigilante - Moser - APS Twins
Well I called Autometer and the only guages that have a data logging output are the analog guages & mine happens to be a digital. The tech I talked to said that the purple wire to the sending unit transmitts the 0-5V signal and that I could try tapping that so thats what I'm gonna do.
I want a guage in my car because I dont always have a laptop in my car to monitor things and I like to keep an eye on the vitals always.
99 T/A WS6, original LS1 turbo
Yep...just run the purple wire to the interface, and ground the gauge wherever is convenient (mine is under the dash somewhere). That's all it takes to log fuel pressure (besides setting it up in the scanner).
Did the preset autometer PID not work?
99 T/A WS6, original LS1 turbo
It didn't exactly match up to what the gauge was reading for me.
Gotcha, thanks for you help
99 T/A WS6, original LS1 turbo
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