I can't believe no one has answered this.
You have it made.
Because your YJ already has the electronic speedo, installing the super short SYE is all to easy. The new sensor that comes with it plugs right into your wiring harness like the original.
According to JB Conversion web page on this subject
, in order to calibrate it you buy a kit or change the speedo to an adjustable one.
After reading on it more, I can see where thier setup has some advantages.
Handicapped license plates are not for mentally
handicapped people -
"Man has not yet evolved an inch from the primordial slime that spawned him." Mark Blankfield, Jekyll & Hyde... Together again
Holley Carb thread