OutLaw305

Quick help on SGI-5b wiring PLZ !!
Ok so i have a new 350 in my engine bay, and no longer have the computer controlling it. My problem is that the computer is no longer in the car.... at all. So where under the dash do i hook the signal wire from the SGI-5b box into the speedo?

options im thinking:
1. from the little yellow box that goes to the speedo
2. directly off of the speedo somewhere


I think #1 would be easier if it would work. Either way i dont know actually which wire (ie color) im looking for. I have a 92 camaro. Can anyone help me?

7plagues

iTrader: (1)

ok i have the same problem and what i just did was take i think B7 from the ecm(its yellow controls the vss) and i just cut and soldered a wire from it inside the car so i can just run it to the box. you need another wire. tan/white??? maybe. but whatever the case it goes from the ecm to the tach.

OutLaw305

so youre talking about a single wire that goes in one side of the box, as opposed to one of the 4 or 5 wires coming out of the other side?

7plagues

iTrader: (1)

im talking about the ecm. that has like 30 wires comin from it. im not sure what your referring to. the yellow box is that speed buffer box and i dont know anything about that.

OutLaw305

yea.... see i dont even have an ecm anymore. Its sitting on my backseat floor right now. So im trying to figure out where i can wire the SGI-5b up to.

7plagues

iTrader: (1)

hmm....i read somewhere that you can get this vss box. its yellow and on like 305tbi cars. im not sure though

OutLaw305

my car was a 305tbi, ill have schematics this weekend. hopefully i can figure it out. Im suprised more people like trickster have not jumped in here. The guys on the electronics boards usualy have your problem solved in a day or two.

25TH ANNI RS

i just converted from tbi to carb and removed the computer and the speedo works fine give it a try and see mine still works without the computer in the car. the signel to the speedo does not com from the computer . the wiring from thebuffer y's out to the speedo and the computer.

OutLaw305

erg i guess i forgot to mention that i dont have the same transmission or gears either. Also i didnt do the swap myself,a shop did for me. I am no about 125 miles away from that shop so its going to be kind of hard to get them on the same page as me. But you said the buffer y's to the speedo. Do you know which color wire that is. Also, can i just bypass the buffer now and go from the SGI-5b box straight to the speedo? or do i have to go from the SGI-5b - to the buffer box - to the speedo?

25TH ANNI RS

it should be a brown wire. i was suprised when i got my car running and noticed the speedo working because everyone kept telling me it would not work. in the tech artical they talk about removing the govenoron are cars by splicing into the harness with a switch. one of them state if you do it close to the computer the speed will still work so this is why i'm saying it y's off. i'm only going from my own experince. i hope this helps...