I recently replaced my water temp gauge and I think you are over concerned about this replacement. Take your time, pull your steering wheel off, remove the speedometer to gain access to the
oil temp gauge. Then you will be able to see behind the dash where the gauge tube is routed. Also, remove the grommet in the opening in the firewall first, it is split so will come off while the wires and tubes are still in place. Pull your speedo cable out, remove the
oil gauge tube from the fitting on the remote
oil filter housing and start working the tube out towards the firewall. Then remove the two retainer nuts that hold the gauge in place and work the gauge and tube out through the dash. It really isn't that difficult, just don't get in a hurry. Reverse the procedure to install the new gauge.
When you get the new gauge, before attempting to install it, I suggest you test it to make sure it works. Boil some water and insert the bulb sensor into the water and make sure the gauge registers temperature increase to somewhere close to 100 C. Ask me how I know about this?
