[Diy_efi] need schematic critique

[Toyota Supra]

hi all,

i need a schematic critique on the schematic housed below, it is in .jpg 
format or .psd

http://68.7.7.84:8080/schematics/

i have included the psd in case someone wanted to edit it to something 
better

specifics on it are as follows :

variable resistor input, ranging from 0 to 3.5vDC
circuit is to kill signal to normally open relay at 3.2vDC
i would like approximately a tenth of a volt of hysteresis


below is a link that i would like to use to control the reference voltage 
for pin 4 of the LM339 chip, will it work?

http://www.mitedu.freeserve.co.uk/Circuits/Power/lm317.htm


thanks to all that look at this

-j


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