[racprops]

The ones I have were made to be used and came with the Zemco MPG Computer.

It uses a light bulb and a photocell, the light is blocked by a small ballbaring running though a grove pushed by the fuel flow.

It is well made and has withstood the fuel pressure on my Chevy Van.

The output is a short, as the instructions say to test by tapping the wires together.

It takes a couple of tanks of gas to refine the calaberation, and it can be updated easly.

I plan on updating the system with a LED and light reading LED.

Both the photocell and light was subject to failure.

The computer is again the Zemco MPG Computer, or perhaps your MPGunio...

The Zemco uses a low rate pulse and I understand it will be slower than the MPGunio.

As I think about it: the flow rate of a fuel injector system maybe higher that the old carb systems, so a system to divide by 2, 4, 6 might be needed to slow down the pulse rate output to the Zemco MPG Computer.

Rich