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Sorry to open another duplicate thread
Hi people, I'm new to the site. I have an 04 base model 3.4. I decided to take a trip to local bone yard and found a 03 Monte 3.8 SS pace car with a mint condition 6 gauge limited edition cluster, what a score. So it was plug and play. Plugged it up and bingo even 1600 miles less than my original. The problem was oil pressure didn't work. So I thought maybe sending unit needs to be for gauge not dummy light. Went to parts store and got sending unit for gauge but it has 2 prong the oem is only one. Went back to bone yard and got the plug from the Monte. Perfect plugged right into the new sender. The original wire is the same tan with black tracer and the other wire is black with white tracer. Now I believe the black with white tracer is ground and I also determined that with a little research on the web. Wired in the brown with black tracer to original terminal wire and of course installed new sender ran the other wire (black with white tracer to ground) and still no pressure. I'm pretty sure the oil pressure gauge is good cause it jumps a little like others when the key is turned into accessory. Every other gauge works fine. Anyone got any thoughts on this. I really want the op
 

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I have the same '04 3.4 Impala and mine had the same problem. After the entire dash stopped working, the windows started going out one by one. Then the security light started coming on until one day it wouldn't crank . Using a multimeter I noticed the ignition wire running to the starter was hot. I had it towed to a friend's shop who took two weeks to tell me he couldn't figure the problem. Had it towed to the Chevy dealership and after $480 they told me it was totaled and something to do with the electrical system or wiring. This car is my baby so instead of getting it scrapped I had it towed home so I can tear out all the wiring and do it myself. 300k miles and always been dependable
 
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