'89+ GTE went up to 160MPH, I can't remember if the N/A's did or if they kept the 150. The 160 is a direct swap though.
No the MKIII never came with white gauge faces. EL faces are available from a few different manufacturers though.
I'm sure it would be fine, I think you only need the housing and control stems... and to modify your own harness to work with them.
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