OK. The gauge doesnt ahave an Isolator, but as long as I can check on it and make sure that the gauge isnt leaking then it would be ok to run inside the car wouldnt it. the instructions says it isnt safe to run it inside the car cause it could catch fire, but if it isnt leaking it should catch fire should it. I bought them thinking it came with an isolator but it didnt. I bought a radio relocator and I was going to put the boost gauge and fuel pressure gauge under the radio....what do you guys think?