Friday morning the hydraulic pump shorted on my snow plow and wreaked havoc on my battery. The post for the positive terminal broke off and all the lead surrounding it actually melted and dripped everywhere. Got a new battery and everything is working fine. The only thing not working is the temp gauge on the dash. When I turn over the engine to start it spikes all the way up, but immediately drops to zero and never moves after that, regardless of temperature. i replaced the coolant temp. sensor. if i disconnect the tcs while truck is running the check engine light comes on so there is a signal going to the sensor... Somoeone mentioned a "coolant temperature SWITCH" - but i can't find any info about that, or if it really exists. I"d rather have a temperature gauge so I want to fix this. Short of replacing the instrument cluster, I'm out of ideas. Any advice?