I just won this auction on ebay....
http://cgi.ebay.com/ebaymotors/ws/eBayI ... &viewitem=

do i need this to run the air/fuel gauge in my 04 grand prix ?
http://store.summitracing.com/partdetai ... t=ATM-2244

if i were u i wouldnt get the A/F ratio gauge, cause it gets waaaay too annoying, as some one told me b4 its just candy for the eyes it'll just keep on goin back and forth and drive u nuts! I ended up hooking mine up to my boost gauge (electrical) and my brother just unpluged his.
as for the 2nd item i think thats just an O2 sensor which u already have

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

i think it is teh oil pressure sending unit

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Nope ... you just need to tap into the purple wire on the O2 harness.

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Under Construction

x2 (existing O2 sensor)

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Black 06 GP GT
S2 IC, 1.9 Rockers, TOG Headers w/ full custom exhaust, CAI, 104 Autolites, Custom Tuned PCM, 3.3....
And still Working its way up....

Here's the install instructions

http://www.autometer.com/productPDF/0837L.pdf

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Under Construction

thanks for the info dsh1106

cool lightshow

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'05 WRX STi - COBB Stage 2|Invidia DP|3" Borla XR-1|Coilovers|Camber Plates|Swaybars|Endlinks|Bushings|Braces|Anti Lift Kit|DBA4000s|SS lines|
Sold: 06 Cobalt SS/SC, 99 GTP 245WHP/326 Ft-lbs, 06 R6