Nope - you're confusing a couple of different swaps. The 1988-1991 moonie gauges are most easily replaced with 1991-only needle gauges, however, you do have to move a few (3) wires around in the connector for the 1991 gauges to work on 1988-1990. Finding the cluster is the hard part as they only came on some 1991 models.
Now the 1992-1994 trucks all have needle gauges but they are a very different connector, wiring, and internal electronics setup - they rely on a separate speed sensor buffer module (we typically refer to it as a DRAC module) - obviously this cluster is much easier to find than the 1991 needle cluster, but is more work to swap into a 1988-1991 truck. You can do it, just more work. There's write-ups out there.. I have preserved an old one, hosted on my site, but I am not the author of the info:
https://someotherplace.com/info/clusterswap/cluster.html
Since you're looking for a tach cluster be sure to get one from a truck with same # of cylinders as your engine, for the tach to read correctly (V6 or V8) and be sure to skip the diesel clusters...unless of course...you're a diesel.
Richard