I need a firewall plug pinout?

1995 CHEVROLET 1500
170,592 MILES • 5.0L • V8 • 2WD • MANUAL
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DP1
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My 95 obs is confusing me! I cant find the pinouts i need that match my truck. My truck is ls swapped with a psi harness and computer. My truck also still has the original engine harness for the use of oil pressure sensor, coil wires and under hood fuse box im guessing so that my factory guages work. I bought the truck like this and everything worked great until i decided i was going try and clean the engine bay up a little by eliminating left over connectors from original harness that i thought i didnt need. Long story short,now my truck turns over but wont fire. I jumped the fuel pump relay and i could hear it but still no fire. I think i may have accidentally cut out a coil wire or something. My truck is a manual and has a t56 but for some reason it has an auto cluster. Can you please help?
Jun 9, 2025 at 4:50 PM
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STRAILER
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Sure, I can help, can I ask which year car did the LS come out of so I can look up the wiring for you? Here is the firewall bulk head connector pin out to help get us started. Check out the images (below). Please upload pictures or videos in your response.
Jun 10, 2025 at 5:55 PM
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DP1
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2002 camaro. I actually figured out the issue. I had accidentally stuck my ignition relay wire in the wrong slot inside the cab. I found it and its now running again with all factory gauges working!
Jun 15, 2025 at 9:15 AM
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STRAILER
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Sweet! Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Jun 15, 2025 at 10:28 AM