Getting there. The case is made out of 2" schedule 20 pvc (which has to be sectioned and sqooshed a bit) to make the internal diameter 2", otherwise you have to use schedule 40 PVC, too bulky.
Words for the pics. Measure, cut, trim, ...
funny thing i'm working on an af gauge myself for my yj difference is i'm building it from scratch it will most likely be a 20-led ruler (they say 10 is not sufficient, 30 being needlessly too many) i wonder what's "wrong" w/ my jeep - it gets 16 mpg in winter, mostly short trips in traffic :-) (fyi, it is a 4.0 manual) i can't wait how the af readings will come out if time permits it should be on the vehicle by next weekend
Peter D. did pass the time by typing:
Looked at the schematics for a DIY air/fuel monitor and might build one later. Just happened that a local speed-shop had this gauge in stock and marked down.
DIY is not difficult by any means and probably about 15$ in parts. Seen two schematics out there. One is a direct feed to the LED bar driver ICs and the other with a smoothing amplifier circuit. Even thought about using a basic-stamp module to build one that can record or even give a bar-graph.
For a trick look you could use these LEDs, setting them behind a couple pieces of ABS plastic would make a real thin bargraph.
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