Originally Posted by Canadian_JOY
Thanks for your comments, Larry.
From your comment I understand engine oil pressure is looking for straight resistance to ground, thus the preference for the VDO. I'm wondering if one could just use the signal wire from the AF2500 sensor (I haven't checked to see if the AF2500 oil pressure sensor is just a resistive sensor or if it does anything more fancy with the signal output)?
Which sensors did you use, and how did you wire them? I'm assuming you used the EIS 4.8V sensor excitation provided by the EIS? In the AF2500 the pressure transducers were powered by +5V thus I think the AF2500 was looking for its signal input as a voltage ratio referenced to ground.
I used kavlico knock offs for fp and it is powered from the eis 4.8 vec output and the .5 to 4.5 voltage return goes to the aux input. Youneed a bit of math to get the settings right, but no resistors
Op is a non adjustable input, so must use the vdo sensor to get it to read correctly. I dont see how you could use a kavlico for this, as the eis will have an internal pull up and be looking for a resistance to grd. As well as a fixed table for voltage to presssure
The eis box is clever for 80’s technology, but woofully behind by modern standards. It is really forced into the market today by grt refusing to duplicate the functionality in their efis units