I finally had time to start on my propane conversion for my 98 GMC. It is from the netherlands and is pretty cool. It reads the factory injector pulses, lambda (o2) and tach. It takes the info and uses it to fire another set of keihin vapor injectors. It compensates for fuel pressure and temperuature. Here are a couple of pics of my first attempt I only had a couple of hours. I tied in the injector simulators and connected the propane computer to the gm harness for the injector signals, tach and lambda. Here is a pic.
(click photo to enlarge)
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