VDO CHT question, increasing wire length Options

[type11969]

Yeah, I know, its crappy and not temp compensated but its what I got so . . .

VDO CHT comes with a short thermocouple which is then plugged into a long wire harness, would lengthening this harness by 6 or so inches make a difference in the reading at the gauge? Seems to me that it shouldn't, the error incurred at the thermocouple to copper wire junction should be the same regardless of the wire length, assuming the resistance of an extra 6 or so inches of wire is negligible. Is this wrong? Is the VDO gauge calibrated to the harness length?

Reason I ask is I recently installed an oil cooler in my bus, at the same time I increased the VDO CHT harness length to tidy up the wiring under my dash. Driving the bus the week I noticed the CHTs to be about 30 or so degrees cooler than usual. Can't imagine the oil cooler really having that effect on the heads. Could also be because it has been hotter recently so it is messing with the lack of temp compensation.

I know, I just need to pull the extra length out of the harness and see what the temp reads then but I'm curious to hear your opinions (and bored at work).

Thanks,

Chris