I wonder why Americans call a speedometer a "speedo" but shorten tachometer
to "tach"?

I have an instrument cluster en route from the Bus Depot to New Zealand,
for fitment to my 84 Caravelle. This 84 has no tacho; I'm not sure what
year US it's equivalent to, probably 84!

I have to assume that my vehicle's instrument wiring will be essentially
the same as US versions, as I don't have access to Australian or European
manuals, only the Bentley, which came with my van. But it doesn't have an
oxygen sensor light.

David Beierl's instructions "here's a circular list. First column is
where..." seems selfcontradictory; the columns are labelled by year-model
1) 80-84, 2) 85+, 3) 85+, but the text says that the columns are 1) where
wire used to be 2) where it (wire) goes 3) where displaced wire needs to
go. Can you please clarify this? (maybe I'm just dense!). Haven't tried the
archives yet.

I repeat Jeffrey R's question: does anyone know whether the 84 and earlier
fuel and temperature senders are calibrated correctly for these later
instruments?

What is needed to get the oil buzzer working on 80-84 buses? This is a
great feature, as it's almost certain that the driver won't see the oil
light's duly glow until the engine begins to clatter...unless it's
nighttime.