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Engine SwapEverything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.
Basically I’m trying to connect tach, speedo, oil pressure, ignition, water temp though the c207. I’ve searched though the stickies and threads. Can anyone break this down for me. If I’m correct “D” is the gray wire for Speedo? Just trying to get my gauges to work properly. I’m using a speartech harness. They bypassed the vats and everything should have signal. They used the 98-02 411 computer. Am I even thinking correctly on this?
You need to find yourself a shop service manual with wiring diagrams. It's just too hard figuring out stuff without that. I don't have all the answers for you because I don't have wiring diagrams for your car, but this might help some....
Most your gauges go through a large connector (C100) on the firewall next to the brake booster. I don't know if the gauge pinouts are the same for 91 Camaro, but here are pinouts for an 88 Firebird to maybe get you started:
Thanks QwkTrip. I’ve been studying both C100 and C207. Of course I’ll need the red A4 power wire, purple for starter solenoid and a pink for ignition. Things definitely change from year to year. I think that’s why speartech stop doing plug and play. Or for whatever reason.
I’m waiting to hear back from Justin at speartech. He said the c207 plug is all you need for gauge wiring. I persisted it was the c100 but what do I know. Hopefully he can find something in the books over there.
So according to this print. You can only access the speedo from the c207? Is that correct? The rest have to come from the c100? If that’s the case I’ll have to loop back around back inside the car where my loose wires are. Correct me if I’m wrong
It is a long time since I did the swap on my 91 RS ,but I think both the tack and speedo went though 207.and meet the existing factory wires under the pass side dash.
It is a long time since I did the swap on my 91 RS ,but I think both the tack and speedo went though 207.and meet the existing factory wires under the pass side dash.
Thanks kestell. How did you figure that out? Followed it all the way thought the car or from a print? Are you using 411 computer as well? Didn’t work like a charm?
Thanks kestell. How did you figure that out? Followed it all the way thought the car or from a print? Are you using 411 computer as well? Didn’t work like a charm?
I did my LS/6l80 swap in 2012/13 and was the first to get Speartech to make a plug and play harness for a third gen . The only wires that were not plug and play were those two. I ran them through Dakota Digital adapter boxes to get the correct outputs for the gauges. I sent Speartech my Camaro harness and they modified it for the LS/6L80 including DOD and VVT. At the time there were no stand alone controllers for the 6L80 so I used the GM E38 ECM. I had the factory service manuals including the electrical book most of which I have since sold. I will look if I have any of the 1991 books yet.
I did my LS/6l80 swap in 2012/13 and was the first to get Speartech to make a plug and play harness for a third gen . The only wires that were not plug and play were those two. I ran them through Dakota Digital adapter boxes to get the correct outputs for the gauges. I sent Speartech my Camaro harness and they modified it for the LS/6L80 including DOD and VVT. At the time there were no stand alone controllers for the 6L80 so I used the GM E38 ECM. I had the factory service manuals including the electrical book most of which I have since sold. I will look if I have any of the 1991 books yet.
Justin at speartech was under the assumption you can get to everything from the c207. That’s why I was so persistent to find out. But the looks of it I’ll have to use the c100 as well. He said a customer sent a harness back in for them to modify and he referenced it being close to the kick panel passenger side fender. That’s probably you kestel. Won’t have to worry about a Dakota digital for correct output since they do that in the 411 correct?
So according to this print. You can only access the speedo from the c207? Is that correct? The rest have to come from the c100? If that’s the case I’ll have to loop back around back inside the car where my loose wires are. Correct me if I’m wrong
Correct, for 90-92 V6 and TPI cars, pin D goes strait to the cluster. For 90-92 TBI cars, use pin K, but jump pins C&F on the buffer box
Correct, for 90-92 V6 and TPI cars, pin D goes strait to the cluster. For 90-92 TBI cars, use pin K, but jump pins C&F on the buffer box
awesome! Guess the next thing to do would be connect my pcm speedo wire to pin D on the male side and plug it into the clear female side and my speedo should work.
Justin at speartech was under the assumption you can get to everything from the c207. That’s why I was so persistent to find out. But the looks of it I’ll have to use the c100 as well. He said a customer sent a harness back in for them to modify and he referenced it being close to the kick panel passenger side fender. That’s probably you kestel. Won’t have to worry about a Dakota digital for correct output since they do that in the 411 correct?
It may have been my harness back in 2017. My installer couldn't get the engine to start. I gave him a Speartech harness and an ECM I bought from another programmer. My E38 ECU started another car in his shop, but the other car's ECU wouldn't start my car. So, I overnighted the harness back to Speartech along with my ECU. Justin said the ECU tune parameters were way off, and he reprogrammed it. My installer suspected a fault in the harness. I'll never know, but the engine started after the combo was sent back. And my installer attached the ECU to the passenger kickpanel.
