Upgrades 28. Stack Temperature Gauge
Once I'd installed the pressure gauge, I moved onto the temperature gauge. This is actually the easiest of the 3 in my opinion as it really only needs the sender changing, wires routing to the cockpit, and then power hooking up to the new gauge. I also decided I wanted the oil temperature to be switchable and so I also hooked a switch in the loop to another oil temperature sensor, which I installed when I installed the pressure gauge parts.
I'd already installed the oil temp sender in the previous post so the next part was to replace the original Caterham water sender with the new stack version. I asked around and the Caterham water sender is only used for the gauge (there is another temp sender as part of the engine which goes to the ECU for diagnostics and to turn the radiator fan on). The Caterham sender is part of the submarine just above the gearbox bell housing. This was a simple job of unscrew the old sender and tidy up the wiring, and then install the new. I used a bit of Loctite 567 on the thread to make sure it was water tight.
I bought an extra wiring harness to connect to the oil temp sender, from which I only used the purple and grey wires. I decided to shrink wrap the wiring so that both the oil and water wires become a single part when routed into the dash. I took the same route as the oil pressure hose and cable tied it all up securely on the way. Once it was at the dash end I connected up the toggle switch (to the purple sender wires), joined all three grey wires (they are neutral), and then I was left with a single plug to go into the back of the new gauge. I chose to mount the switch next to my dimmer under the knee panel on the drivers side.
The new gauge harness also required a green ignition switched live, red/white lighting and a black earth wire connecting to it.
Once complete I took the car out for a test drive (which I needed to do as part of my video collection for my low oil pressure issue for Caterham Silverstone), you can see in the video where I mounted the toggle switch and the effect it has when toggled.
