Gauges

I just installed three gauges where the CB radio was. There are blue tooth combos available and I always wanted voltage, temprature and oil pressure right where I can see them. I wanted black ones but the hollow eyed guy at OR couldn't find the number for them so I got these at AZ. $35 plus tax. My question for you guys is, how would I embed the thermal couple under the cam block? I thought about a piece of fuel line but it might insulate it and give a false reading. Any ideas?
Steve