Greasecar conversion kit 3 way switch

I just got my forst WVO mercedes 124TD. It hsa a 2 tank greasecar conversion on it. I recently added my filtered WVO to the second tank and cannot figure out which position the 3 way switch should be in for start up, driving on WVO and shut down. The light does not work either. In all three positions the exhaust still smells like petroldiesel.

Please help. Everything apears to be correct.

This car ws converted when I got it.

Steve in Redondo Beach

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