Unshielded wires

[Vanspeed]

While I am problem solving my cooling issues there is another thing I want to ask about. I have lacquer covered cloth wires on my Flathead. I believe they are non shielded. When I first installed the engine I could not get readings on my multimeter, it would just go nuts. I bought a laser temp gun to pinpoint on my engine what temps it is at and that thing goes nuts too. I imagine I am getting all these wacky readings on my equipment because of the wires correct?