420A speedo stuck 80mph

[sinisa]

my speedo rises and stuck 80mph when the car move 10mph and faster, while the tachometer shows correct. i guess previous owner installed wrong speed sensor or wired wrongly. anyone encountered this type of problem?
and does this cause car to run rich when my speed is under 80mph?

 

[Cougar232]

If there is no driveability difference after gauge did this it could be the speed sensor itself or wiring(unlikely unless previous owner messed with OEM) Do you have a 5 speed or Auto trans and is it 1G or 2G?

 

[sinisa]

mine is 2g 5speed fwd. it does not completely affect driveability but when i shift down as i press clutch pedal rpm jumps. new speed sensors have different type connectors so you have to change the connector. if he changed the speed sensor it could be wired wrongly i guess.

 

[wolf alchemy]

(BS post)
Maybe your flux capacitor died and your car thinks its still flying through time.