I spent quite a bit of time e-mailing back and forth with a tech rep at Auto Meter. In the end, like Flash75 says, the oil pressure gauge would be easy to hook up. The guy from Auto Meter says that the factory water temp sender can not be removed or tampered with without causing serious issues. So, he recommended an in line fitting that splices into a hose running to the heater core. In the end, I do not think that I going to install either, as much as I would like to, because I can not find a decent place to actually put the gauge in the passenger compartment; there is simply no room!