everything went smooth and it works with no problems. I turned the idle down 600 rpm's. My question is this:the white wire is for the light? I spliced it to the yellow wire on the side of the headlight switch.Haynes manual wiring diagram shows it(being the yellow wire) as the inst.lamps. Am I correct in splicing the white into the yellow for the light on the tach to work? If the wiring for the tach light(no shift light) is correct,I'm assuming the bulb inside may be burned out.Is it changeable and if so,what size bulb does it take? the tach is a mini sun pro ll,or something like that.maybe 2.5" dia. As for the ground,the tach seems to function properly,other than the light issue.The instructions I found online say a good engine ground,yet someone on here recently stated that he ran his to an old speaker mounting point. Is that sufficient?Mounting to the dash instead of the engine.