cooling system woes

[Boog]

Hi guys. My truck: 85 k5 blazer, 305 auto, all stock, 138,000 miles.I have a new 195 thermostat, new gauge, new sending unit but it still shows to be warmer than normal. On cold start up, it warms up nicely but keeps going to sometimes 250 before it eases back to a usual running temp of about 220 to 230. Atleast that's what it is showing. It never boils, ever. Water pump is doing it's thing just fine. Radiator was recored 3 years ago, now a 3 row. No loss of coolant out the pipes. I've checked the wire from the gauge down to the sending unit for grounds and found none. Most of the trucks I've seen the gauges usually read on the low side. I think the engine is running some warmer than normal but not enough to boil over. I've seen it read 260 breifly before settling back down to the usual 225 or so. I'm puzzled here. Any ideas? Thanks, Boog.