I have the Shop Service Manual for the '87 and there is nothing in there that shows for sure that there was one offered. Just the lead at the coil for hooking one up.
You'd have to find a smaller fuel guage to make the change (I did see a tach with a fuel guage included in the same instrument, but the mounting appeared to be slightly different than for the '87 panel). I've seen pictures of a couple of earlier model tachs and they appear have similar mounting similar - but not exactly the same - as the 87's fuel gauge pocket.
I know of one fellow who installed a small aftermarket tach in the unused hole in lower left corner of the dash. Looked pretty good.
FWIW - sorry don't have better info
Tony
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'87 3/4T Suburban / 502HT / Edelbrock MPFI /
Gibson 3" / GV overdrive / 3.73 - one strong trailer tug
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'87 3/4T Suburban / 502HT / Edelbrock MPFI /
Thorley /Gibson 3" / GV overdrive / 3.73 - one strong trailer tug
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