1972 Gauge cluster needs tach and repair

[muddpile]

My old truck has the extra bottom gauges in it, but not the tach. The fuel gauge and the oil pressure gauge do not work, and the bezel is de-chromed. I will be replacing the oil pressure gauge and the fuel gauge (and likely the sending unit too) and would like to add a tach. What is the best way to add a tach to this? I would like to use a stock one from LMC or Early Classics or something to keep with the stock theme. I have also seen complete gauge clusters for sale from these places, would this be a better idea? Are there any other alternatives to the stockers that look good and a novice like me can handle? Thanks!