Hi Guys, Not sure where to post this or even if it's ok to ask in here but here we go. Pre-amble I have a problem with the temperature sensor/display on my car. Now trust me, I have done just about everything I can think of to fix this little 'glitch' with no joy at all. New Sensor, Coolant changed, Thermostat changed etc. What happens is this. I can use the car every day for weeks and it is just perfect, temperature gauge is in the middle, only dropping very slightly, if I am on the Motorway at speed, then it goes back to the middle after slowing down. Then, for reasons only known to the car or its ECU, once every blue moon, I see the Check Engine light come on, then 10 seconds later the temp Gauge rises to the top, Red Light comes on and it stays there. First few times, I pulled over, checked under the Bonnet but all was fine, it was not overheating, it did not smell hot, if that makes any sense. Get back in the car, ignition on, temp gauge is back to normal. Check Engine light goes off after a few normal driving cycles. Drive for weeks or even months before it happens again. Ignition off, for 30 seconds, it clears and away I go. Question So I want to monitor the temperature because on the one occasion I decide to ignore it, the darned thing might just be overheating....lol Was thinking of a temp sensor, taped, using self amalgamating tape to top hose, then feed the cable into the car, somehow and use a small LED display to show me a constant temperature of the outside of the Top Hose. Power would be from 12v supply or even a USB if needed. Does anything exist or do I need to build something? Thanks in advance.