I have a question. Will a instrument cluster with a tack work in my truck that did not have a tack work in my truck?

depends on the year model range of your truck and the donor cluster's. pretty much any 1995 thru 2003 cluster will swap over. same for 04+. not sure on the years for pre-1995.
i swapped in a cluster with a tach from another 99 into my 99 that came without one. plugged right up and works like a charm. tach worked immediately. the speedo was a chore though, you've got to re-calibrate. there's a couple good writeups on here that walk you through it. also a great youtube video out there that shows you how

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1999 xlt 2.5l 5-speed Supercab 159k
83 diesel 2.2l na
06 F250 6.0l psd
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