So I have tired searching the site for a solution to my problem and I have not been able to find the answer, any help would be grealty appreciated. I have a 1988 Firebird that originally had a 5 speed v6, I have swapped in a carbed v8 with a t-5. Currently there is a mechanical vss in the tail shaft of the transmission with no provisions in the cluster (original to the car) for a speedo cable I am wondering if it is as easy as replacing the mechanical vss for an electronic vss? If this is the case does it matter if the electronic vss comes from a v6 or v8 manual transmission? I would really like to be able to use the factory speedometer/cluster if at all possible.

 

Did you remove the yellow box that was attached to the computer?

 

Yes it's that easy. The speedometer doesn't care how many cylinders the engine has.

 

To the best of my knowledge the yellow box should still be in it's original location as I don't remember removing it, but I'm uncertain of it's exact location. So I should try to locate an electronic vss, any ideas on the best place to pick/order one?

 

http://www.tpiparts.net/inc/sdetail/7586

 

http://www.tpiparts.net/inc/sdetail/7586

 

http://www.tpiparts.net/inc/sdetail/7586

Thanks for the link and diagram, very helpful information. In the picture of the retrofit vss it shows a connection for a speedo cable and a two wire connector, does that mean it would work either way, mechanical/electronic?

 

stock tpi, tbi and ccc used a vss in the transmission, If you dont have a vss in the transmission and just have a prevision for a cable drive use the retrofit one. The both wire up the same to the buffer. converting a magnetic pulse to optical. just leave the unused leads disconnected on the buffer. ecm input cruse. If you are wanting to convert to just a cable drive 86-86 use cable drive speedometers maybe 87 not positive. The cable driven speedometers had a optical sensor and output to the ecm on the circuit board. sorry about the double post stupid internet fail !!