I have a 1982 TransAm with cable speedo none electric cluster. I am
swapping in an 1989 Formula electric speedo cluster. As we all know there
doesn't seem to be any guidance on this here or any other board/website.
You will also need to have a VSS speed sensor on your tranny AND
the 'yellow' box near the ECM from the electric cluster car. Instructions
for the VSS and yellow box wiring can be found here.
http://www.hioutput.com/tech/speedo.html
Not shown is where the green/black speedo wire from the yellow box
goes on the cluster... it goes to L14 'lower connector position 14'

This shows how i moved the wires 'from --> to'. 'U' is for upper and
'L' is for lower connector.

UPPER CONNECTOR 'black'
7 6 5 4 3 2 1
8 9 10 11 12 13 14

1. green/ Temp --> L5
2. pink/ fuel gauge --> U10
3. grey/ Instrument cluster lights --> Stays here
4. black / ground -->U2
5. cruise? NOT USED
6. cruise? NOT USED
7. cruise? NOT USED
8. cruise? NOT USED
9. light blue/ dir. left --> U7
10. NOT USED
11. NOT USED
12. dark blue/ dir. right --> U9
13. pink-black /(+12v, shift/ses) --> L9
14. yellow/check engine --> i did not use it

LOWER CONNECTOR 'white'
14 13 12 11 10 9 8
1 2 3 4 5 6 7

1. Light green/High-beam --> U8
2. Not used
3. Not used
4. blck/grnd(inst.cluster lights/fuel/temp) -->L2
5. blue/lite-blue choke --> L4
6. tan/white brake light --> U1
7. not used
8. Not used
9. Not used
10. black/ground (volts, oil, fasten seat) --> L12
11. tan / oil pressure --> L8
12. yellow/ Fasten seat belt light --> L13
13. Not used
14. white/ tach --> L1

 

all i can say is DUDE.... You're a lifesaver....

 

How did you switch around the wires, did you splice them or did you just take the pins out of the harness to the cluster and move them accordingly?

 

I carefully moved the pins. There is no need to splice.

 

Man this sounds like a pain, Whatever newer cluster rocks socks.