Hello..I have purchased a boat with a 99 Johnson 90hp on it. it has the plug under the dash for the system check gauge but there is no gauge installed. Do I only need the gauge or do i need to purchase the horn/buzzer as well? Is this horn/buzzer located under the dash or is it on the motor? What should i be looking for? i would like to test the horn before ordering a gauge incase i need to order a new horn/buzzer at the same time...<br /><br />thanks<br />Chad
