Outer Limits 4x4 Board

I have just had a Harrop (Eaton) ELocker installed into the front of my HZJ78 Troopcarrier.

I would like the factory dashboard front locker light, in the combination meter, to come on when I activate the ELocker.

The Elocker has it's own loom to power the ELocker with positively switched 12V DC.

If I want to turn on the negatively switched dashboard light with the ELocker circuit, I assume that I have to put in a relay to switch the dashboard light circuit to negative, using the positive of the ELocker circuit to turn the relay on.

Would this be right?

Is there an easier way than wiring in a relay to negatively switch the dashboard light on?

Sounds correct to me.

Sounds like the best option to me my toyo has a gremlin from incorect earthing giving me the shitz

Just a npn transistor that will switch enough current for the light and a current limiting resistor on its base will do the trick nicely..