Alright, I have this project I am working on. i am putting together this project for my car. It is called JAW (just another wideband.) It is a DIY wideband controller and display, that also can display EGT, boost and RPM with daisy chained displays.. I personally want to display Air Fuel Ratio, Exhaust Gas Temp, and boost. I am installing the kit into a DIN box, one of those little cubby holes that fit under your car's radio, so my area on the front for displays is limited. I could just barely squeeze the 3, 7 segment 4 character LED displays in there, but it would look a lot better if the AFR one was shown as a bar graph. Here is a link to the website http://14point7.com/Widebands/JAW_1_041/JAW_1_041.htm. The guy who makes these does not give out the schematics, but I know the wideband signal varies from 0-5V and that the display board uses a mc14489bpe to drive the display. I know that you can easily make a bar graph voltmeter using a lm3914, but I can't simply replace the mc14489bpe. I don't know much of anything about electronics, but the lm3914 doesn't have a data out so there would be no way to pass the data to the next display. My only idea is to use the output from the mc14489bpe to send a signal to the lm3914, but I don't know if that would work or how I would do it. Anyone have any ideas? Also, how would I attach a PDF?