Outer Limits 4x4 Board

Have put a patrol tank in my hilux and the sender is a different frequency to the Lux sender, there is a guy in blacktown who can change this, but as I work six days a week can't get to him, so wondering what other options are available, should I get a new Hilux sender(my old lux one is dead) and mod it to tank, or whole new gauge and sender (would prefer to retain hilux gauge rather than have an extra one, or would Jaycar have something to change the frequency, any help appreciated.

John