Engine Cylinder Heat Sensor, Modification? Options

[martinef1963]

Hello to all. I have never read on the site, not that it hasn't been discussed - the use of the FI engine cylinder heat sensor being used on VDO gauge for a car that has been converted to carbs.

The install of the ring of the VDO sensor is held in by the #3 cylinder sparkplug to engine case - while R&Ring the sparkplug that ring gets beat up and access to it with the tin is a real pain in the....

If one splices the wire to positive on the FI sensor, does the sensor not ground itself to the engine and send signal to VDO gauge? Or do you still need the negative feed back to the gauge. Just asking.

thanks,

Fern

[ThePaintedMan]

I don't know enough about electronics to know if the signal that the original CHT sender puts out would even be close to the very, very tiny electrical signal the VDO guage needs, but I doubt it.

On top of that, many more experienced engine gurus here have said the most accurate place to measure the hottest engine temps is under the spark plug.

The solution is here:
http://www.germansupply.com/xcart/customer...t_install_2.tpl

I just did it on my spare engine while it was out, and it worked like a charm. Never have to worry about mangling the sender again, and I was able to run it back through the original CHT hole in the tin.