New Temperature Gauge

My Coolant Temperature Gauge doesn't work any more on my 94 LT1. I bought a new one that's a dial gauge dash mount. If I hook this up, is it going to mess with the way my computer thinks the engine temperature is? If I unplug the one I have now, my cooling fans come on and stay on. Also are there two inputs, one on the block and one in the water pump? Which one controls the gauge? Thanks.