Compass into a low spec model Pajero

[TazmanCrash]

Hi there all. As the title says, Im trying to put a compass into my 93 Soft top pajero. I pulled the altimeter from a high spec modal, took the clock aswell. I pluged the small loom into the main harness & the clock works fine, all the lights work fine. But no compass. I took the small box theat sits on the dash aswell. Any ideas?