Panchos54, The temperature gauge and sensor are connected by a small diameter tube. You can't disconnect the tube without destroying the gauge. You need to fish the sensor and tubing thru the firewall and attach the gauge in the cluster. You'll likely need to remove the grommet at the firewall to give you enough room to get the sensor bulb through the hole. The grommet should have a split in it to allow you to slip the tube into the center of the grommet then replace the grommet in the firewall after you get the tube routed.
