Thread: Can I connect a second temp gauge to the TD5 temperature sensor in the cylinder head?

No!
in 99.999% of instances.

That is, each sensor has a very fine output range, and a gauge needs to be calibrated for that sensor output range.

So Sensor Type A, works with Gauge Type A.
And Sensor Type B works with Gauge Type B.

But Sensor Type A may have a signal so that Gauge Type B may show some value, but that value will probably be wrong.

simple example: your TD5's sensor won't send a correct signal to a Commodore Temp gauge.(very likely not too, but won't know till tried)

If you hooked up a VDO gauge to the TD5's sensor it either won't show anything, or show an incorrect value.

Only a TD5's temp gauge will show a correct temperature from a TD5's temp sensor.

Whatever coolant temp gauge you bought, SHOULD have come with a sensor to use with it. If it didn't then you will need to find one that is compatible for it .. ie. not just any sensor.

No. These are resistive sensors with power supplied by the gauge.