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-   -   speedometer (http://www.hotrodders.com/forum/speedometer-228637.html)

donwp 01-20-2013 07:04 PM

speedometer
 
I put a 4.8 motor and transmission in a 95 S10 and I cant get speed ometer to work.
Can anyone give me a diagram of how to hook up computer to speedometer to make it work.

LATECH 01-20-2013 07:37 PM

4.8 litre? did you put the wiring harness and PCM etc on the vehicle?
Are you running a carb? More info plz.

donwp 01-20-2013 08:30 PM

Quote:

Originally Posted by LATECH (Post 1637049)
4.8 litre? did you put the wiring harness and PCM etc on the vehicle?
Are you running a carb? More info plz.


yes wiring harness and PCM

LATECH 01-20-2013 08:56 PM

4.8 is a newer communication system.It uses CAN or control area network.
The 95 may or may not be CAN.
The 4.8 electronics will send a completly different signal than the 95 as the 95 would most likely be a pulse modulated signal, like a square wave or sine wave,unless it is CAN also.
You will need some type of converter that will read a CAN protocal message and convert it to a pulse.
The only other option would be to tap into the vehicle speed sensor at the trans, and wire it to the speedo input at the cluster. I would have to research the wiring diagram for the 95 to see if the speedo processes the speed signal or if it is processed in the PCM.
If the 95 used the speedo to process the speed signal, then it could be as easy as splicing to the VSS at the trans and maybe putting a signal amp on it, as it may not have enough output to run the new PCM and the speedo.
I will need to know what the vehicle is and the donor vehicle is, so I can check system configuration and check wiring schematics. it may be as simple as moving a few wires around in the newer donor car harness, or splicing 2 wires at a different location.
Did you have to cut any wires from the old harness when installed the new?
Also what was the donor vehicle?

LATECH 01-20-2013 09:09 PM

The Dakota SGI-5 C may be just the ticket
Looks like it can be tied right to the VSS with no problem. Then adjust for your specific speedometers needed input.

donwp 01-20-2013 10:14 PM

speedometer
 
Quote:

Originally Posted by LATECH (Post 1637081)
4.8 is a newer communication system.It uses CAN or control area network.
The 95 may or may not be CAN.
The 4.8 electronics will send a completly different signal than the 95 as the 95 would most likely be a pulse modulated signal, like a square wave or sine wave,unless it is CAN also.
You will need some type of converter that will read a CAN protocal message and convert it to a pulse.
The only other option would be to tap into the vehicle speed sensor at the trans, and wire it to the speedo input at the cluster. I would have to research the wiring diagram for the 95 to see if the speedo processes the speed signal or if it is processed in the PCM.
If the 95 used the speedo to process the speed signal, then it could be as easy as splicing to the VSS at the trans and maybe putting a signal amp on it, as it may not have enough output to run the new PCM and the speedo.
I will need to know what the vehicle is and the donor vehicle is, so I can check system configuration and check wiring schematics. it may be as simple as moving a few wires around in the newer donor car harness, or splicing 2 wires at a different location.
Did you have to cut any wires from the old harness when installed the new?
Also what was the donor vehicle?

the donor was a 2001 gmc somona 4.8 2 wheel drive-------yes i cut some wire from the s10 system but i dont think that i cut any from the speedometer


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