I am posting a wiring diagram for a Vista Diesel. I've got issues as this tractor was sitting quite a while until I overhauled it and it runs great now but no gauges work at all. I had to put on a mechanical oil pressure gauge to run it out but I have no temp gauge, trans pressure light or even the amp gauge won't move. I found and cleaned the ground strap that goes from the metal plate under all gauges to the frame but that didn't help. I don't think the fuel gauge worked before. I do have power to the key and can key start it now. I found a melted pink wire in the harness going to the voltage regulator so replaced that and now the regulator clicks when key is turned on. I have power to both sides of the ammeter, is that correct or is it just passing through? This diagram shows from live starter terminal to positive side of ammeter, I have live to both. It was that way but maybe I should disconnect the negative terminal and connect to the B on alternator like it shows or doesn't that matter? Then the diagram shows the regulator as (B)& F terminals but my regulator has 1 2 3 4 numbered posts so I don't know where to hook things up to?? Any pointers would be appreciated.