HI New to this forum and to Harleys. I recently purchased a 1995 Harley 883 Sportster with a speedometer only. Just replaced the speedometer with a combo speedo/tach bought on EBAY for a 95 sportster. Works fine. My question is this. The tachometer on the new speedo/tach combo has an indicator light on the lower (6 o'clock) position of the gauge. The word ENGINE is printed directly below this light indicator. WHAT IS THIS INDICATOR LIGHT FOR AND WHEN DOES IT COME ON? THANKS!!!!