Question about factory tachometer

[72blu]

Hey guys! I recently aquired a gauge cluster for my 1978 cheyenne that has a factory tach. The cluster came out of either a 78 or 79 3/4 ton dually. Unfortunately the plastic lens cover as well as the plastic casing that the gauges sit in is in pretty bad shape (cracked and missing chunks). My question to you guys is would it be possible to simply take the tach and small fuel gauge out of the old casing and put it in the casing thats currently sitting in my truck now? My truck isnt a factory tach truck so im not sure if it will have all the wiring required to switch it over. Thanks!! I also included a pic of the gauge cluster with the tach
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