I know of a case where we set up the engine only to have the owner come back and say it was not running right. Attached the gauges was out by a long way. Approached the C/E said some one has tampered with it. Reset the fuel system again, then he came back again with the same problem, done it again with the same out come. Sent it away. Came back again same problem this time we made our own colour tamper proof mix and applied it. Guess what came back again. The costumer was given his log bogs and go to another shop. He had been adjusting it himself.
Chers