boost guage and zener diode questions...

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i ask cuz i finally got around to hooking up my
aftermarket boost guage, and the numbers
certainly are not jiving.

in fact, they're not even consistently not
jiving.  sometimes the digital guage will show
1.2BAR, and the new guage shows 3psi, while other
times it may show 6psi.

weird.

oh yeah, zeners.  i'm not having much luck
locating one.  i've got the 470Ohm resistor, now
i need the 4.3V zener diode so i can do the
robert myers ECU mod.  anyone?  i'm in canada, so
US locations probably won't help me too much.

maybe it's used in some cars somewhere? 
something i can yank out of old an ECU something?

lastly, when doing the resistor mod, is there a
positive and negative to the diodes that has to
be followed?  as in, does the positive side need
to be soldered to the motherboard, and the
negative to the daughterboard?  or vice versa?

thanks, everyone!!

jason
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