exhaust gas analyzer for FI bus

Not sure if this is in the right place, feel free to move it not, I'm looking to rent or buy (I think it's called an LM 1 or 2) exhaust gas analyzer. I'm about to add back some stock FI peices and i don't want to upset the mixture.

I am replacing the exhaust on my bus with a header and a quiet pack (original muffler is toast). and I am thinking I will weld in an O2 sensor bong on mine to test with. Can use a multi tester that way to see what the mixture is.
KC

Sweet, hopefully I can scrounge one to some testing with too.