I have a 2005 GT which I plan to keep forever. It's very low mileage; mostly rests in garage on battery maintainer. Within the past 3 yrs, I've replaced the tach and the fuel gauge. A few months ago, the ammeter stopped working. Today, the oil pressure gauge stopped working; both are frozen at about 1/4 of their travel. This is all very discouraging to me. I understand that many GTs have gauge problems. My question is whether to have these replaced now or wait for the remaining gauges to fail and have them all replaced at the same time? Also, once a gauge is replaced, is it likely to remain functional or have owners had to replace gauges multiple times? Thanks in advance.