Fox Need help

Please help I have a 1989 ford mustang gt and want to replace all of the original gauges with aftermarket gauges.I was told that shouldn't be done because it will cause a lot of electrical problems.This was told to me by a mechanic is this true? Thanks in advance for any help
 
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Every gauge is mechanical besides tachometer I went and bought the tachometer and speedometer today to have all gauges. I plan on taking out old factory cluster out and putting a piece of cutout steel to house all the aftermarket gauges
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