Speedo Swap Q

[superbird]

I am looking into swaping my 120 speedo in my 1999 firebird to a 150 model. I am already aware that the only problem will be the tach and it will be like off by about 25%. Is there any way to fix this.

Lets say dissasemble the speedo for the 120 model and take out the (thing that controls the tach moving, has four pins, and conects to the speedo computer board) and swap it out with the one in the 150 speedo.

Would this work or do nothing.

ALSO

Will the 150 speedo show the millege of my car or the milledge of the car it came out of

thanks for any help
Michael

[wolf]

here is a tach interface
http://www.dakotadigital.com/Detail....rtNumber=SGI-8

mileage stay with the gauges,not the car

[hockyman88]

u can keep ur milage gauge thing from ur spedo and put in in the new one so that the miles are right, i did this in mine, i changed it for camaro gauges and just kept my old odometer