1981 speedo

[aussieta]

i have an opportunity to pick up a 1981 speedo, it has an extra blue 3 pin plug hanging off the back
some tell me this is a digital speedo and requires a speed sensor in the transmission
others tell me it is a suppressor to stabilize the speedo
can anyone confirm what this plug is for
and whether this will work with standard speedo cable
this is to go in my 78 ta
thanks
andrew

[Wallington]

I couldn't tell you, but probably have a regular 78 speedo if needed.

[aussieta]

thanks, this speedo is only km/h, which is why i am interested

[firebirdparts]

i have an opportunity to pick up a 1981 speedo, it has an extra blue 3 pin plug hanging off the back
some tell me this is a digital speedo and requires a speed sensor in the transmission
others tell me it is a suppressor to stabilize the speedo
can anyone confirm what this plug is for
and whether this will work with standard speedo cable
this is to go in my 78 ta
thanks
andrew

Other way.  it IS a speed sensor and was used in the computer control era to trigger TC lockup.  If you don't use it for anything, then nobody will know.  The speedometer is mechanical.

[aussieta]

[/quote]
Other way.  it IS a speed sensor and was used in the computer control era to trigger TC lockup.  If you don't use it for anything, then nobody will know.  The speedometer is mechanical.
[/quote]
awesome, thanks for that