In a message dated 12/4/2011 9:03:54 A.M. Eastern Standard Time,
greenvanagon@GMAIL.COM writes:

Hi  everyone,
I'm interested in adding a tach to our '83, so I was wondering if  anyone
had an instrument cluster in good condition that includes one that  they'd
be willing to sell for a reasonable  price.

i have several..usually get $150 for a late model cluster w/ tach and
digital clock.. you use your own speedo to keep your existing  mileage. i go
thru them and repair all plastic mounts if needed prior to  sale (its
impossible to find them these days with no cracks)

you will have to do some pin swapping on your plug and run a wire back to
the coil from the tach pin to get the tach to work, but i have the diagram
for  that.