jigga009

I've been looking around for a oil/temp sensor from AIM with an extended tip on it to work for transmission oil temp duties, but it seems that none of the AIM offerings fit the bill. My old PT100 sensor has no tip at all, and the newer version of the PT100 sensor doesn't have much of a tip on it at all - at least, one long enough to reach the oil stream..

Only option then is to create a "custom" sensor to work with the AIM display using something such as a Delphi 12160855 GM Coolant/water/oil temp sensor, which is a widely used 0-5V sensor for standalone ECUs and the like. This sensor has an extended tip which would reach into the oil stream to measure temperature effectively.

Question is if anyone has any experience doing this? From the reading I have done, the AIM sensors tend to work based on voltage differences, while other such as the Delphi units work based on resistance difference. I suspect that some kind of pull-up resistor would be needed in order to make use of the calibration table that is available for these sensors. Not entirely sure as to what is involved though.

Is there a how-to anywhere on doing this?

Matt Romanowski

You will need a pull up resistor. To calculate that, you'll need to know the curve on the sensor you bought.

This video has the custom sensor creation.

jigga009

Wow, that was fast! Thanks for the help Matt! Off to watch this video now.

Matt Romanowski

I've got a ton of harnesses to make. If you have the connector for sensor end, I can probably make the rest with the resistor included.

Matt Romanowski

I have a sensor like this one that is magnetic. It's designed for transmissions, but would work in a motor as well. It's a PT100, so easily used with an AiM systems. I put the pull up resistor in the cable. Let me know if you're interested.

jigga009

Price? What thread is on this sensor? What is the diameter and length of the tip on the sensor?

I was actually thinking that one could skip the use of the 1/8NPT (F) ->1/8BSP (M) adapter I already have that I was going to use to mount the 1/8NPT sensor to the transmission (1/8BSPT hole) by just looking for a 1/8BSP sensor instead.

Matt Romanowski

They would be $175. I thought they were 1/8 NPT, but they might be M10. I will have to check tomorrow.