937carrera wrote:I think you are trying to solve a problem that maybe cannot be solved.
I think I have solved my problem already, not sure what problem you think I'm trying to solve?
I found a place to mount the sender/sensor in the sump oil where VW IMO whould have measured oil temp, and anm getting a reasonable accuracy this is what I was trying to achieve.
I found that cheapo temp guages are crap and you have to buy a better one.
I found that there will be some temperture lag in almost any guage becuse the sender/sensor is a chunk of metal and probably attached to the case and that has to heat up / cool down and it often does it slower than the oil heats up / coolls down ( depending upon driving style)
I found that when driving slow the oil temp stays quite low and consistant but as soon as you drive it hard it raises rapidly.
yes a sump plug sender would work but not for me as it's really not suited to a WBX and the connector poking out the bottom is subject to damage, it has to be removed each oil change.
A oil pressure relief mounted sender/sensor is not accurtate as it's not in the sump oil ( no oil flow when hot)
Mounting a sender/sensor in an oil gallery will likely show a higher temperture but that won't help me to see if my engine is within VW spec.