No get rid of the black box.Use the OBS oil and water senders ,they will connect to the 98 truck wires.The 411 PCM has no need for oil pressure input,before the engine goes in re-tap the passenger side head for the old water sender,the driver's side water sender is needed for the 411 PCM.Originally Posted by shmiet
Oh right on. Thanks man. Do i just repin the tss, brake, speedo, tach, check engine, and fuel pump then to the new pcm? Is it possible to make a lm7 pcm to work like this or does it have to be the 411?
Last edited by shmiet; 03-11-2013 at 02:11 PM.
For your temperature sender, here's some info that I would have used if I had it:
http://www.impalassforum.com/vBullet....php?p=2667060
This was passed along from another member and I'm just doing the same.
I'm not sure if the new PCM will operate your temp and oil pressure guages. The only way to tell is by the use of a wiring diagrams for your new engine/harness and your existing truck wiring diagram.
In the new PCMs, all the sensor wires are fed into it and the PCM then sends a signal to the logic board in the instrument panel. The logic board deciphers the signals and makes the guages work accordingly. If your existing instrument panel works the same, then maybe the logic in your instrument panel can decipher the signals coming from the new PCM.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John
Does the wiring for the temp and oil pressure go to the gauges or?. That link still work? says page not found.
Last edited by shmiet; 03-11-2013 at 07:36 PM.
Do the Chevs use a BCM(body control module)? I know my swap is different, but I needed to use the BCM out of my wreck to power up the dash guages. Some worked, but not all until I had hooked up the BCM. And that included the diag reader plug.
1978 C20 short bed pickup, GEN111, 4L60E trans.
They do have a BCM; however, I haven't read about anybody having issues with that, when doing this swap. It seems to be an issue with the gauges not being able to communicate with the ls pcm gauge signals. I think i need to splice into the tach and speedo wires. Im not sure how the oil pressure signal wires up- from what a post in this thread says, i can connect directly to the sensor, as the pcm doesn't require the signal. And coolant temp will require a obs coolant sensor and a ls coolant sensor, one for the new pcu and one for the gauge. And i can use the 896 pcm and remove the "black box" and use the black boxes- brake, fuel pump, and check engine light
Can someone please confirm this? I really appreciate everyones help. I apologize that some of this may be trival for you
i have a stand alone harness & it has a wire for speedo & a wire for tach. speedo works but my tach is off. i need to put a resistor inline. oil pressure is just ran off the sensor straight to my gauge. i'm using the LS sensor with a single wire plug i bought off ebay. for coolant you can run the factory LS sensor on the driver side that will go to the ECU & a separate sensor on the passenger side to run to your gauge. you will have to buy an adapter for this, or you can buy a 3 pin coolant sensor with a mini harness off ebay. it's one sensor that runs to the ECU & has a separate wire for a gauge. that's what i have in my truck & will be running the swap on my IS300 swap. you can look through my build thread & see the parts i used, should be linked in my signature.
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