Just finished swapping out my instrument cluster on our daughters
94 GS300.

As Ray O had mentioned, even though the odometer display could be
removed, the odometer reading from the new instrument cluster stayed
the same.

Consequently, what I had to do was completely dissassemble both
clusters and swap out the instrument face, which has the needles
connected.

A time consuming PITA but it was pretty straight forward.  While
I was at it, I tested and replaced half a dozen burnt out bulbs. (good
lord, who was the crackhead that thought it's perfectly normal to
place 20 bubs *under* the main circut board?).

Put it all together and the odometer reads correctly, the instrument
lights are all functional and the needles are all bright red! :-)

Thanks Ray for all the help.