That spring compressor sounds to me like a DPO addition - there wasn't one
on my (UK) '78, and I don't recall anyone ever mentioning one before on this
or the other forum I haunt.
Mechanically there isn't a great deal different with the '78 that wouldn't
be an issue on your MkIII. The tach is electronic, since the later
distributor doesn't have a drive for a mechanical tach. There's a few
wiring differences - but it seems that Triumph changed the wiring, at least
slightly, every couple of months! Otherwise, most issues that I can think
of are pretty much universal across all Spitfires. Apart, of course, from
all those DPO mods that make every one of our cars unique...
Richard Gosling
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