Hi all I have a ef Fairmont I'm doing up I have a set of 18s and superlow king springs to go in with shorten shocks and I also have a 3.45 LSD with pacemakers and exhaust to go in what else do I need I have been told I need a speedo sender to keep my speedo correct would changing the ecu make any difference I want to chip it and tune it any info would be great thanks

i have a 3:45 and 19" wheels and my speedo is out 5km . I'm assuming u have a 3.08 . So going to 3:45 you will need a Speedo gear to correct it . Which is in the gearbox