Hi all sorry for sounding a bit dim but, recently when changing my speedometer on my st170 I noticed behind there was a wiring loom with a grey connector plug. This had been disconnected probably by a former owner. What is this lead for and do I need to connect as the clocks seem to work fine without it ?

 

Does the engine light come on when you start then go out after? If not, could be that the light was on and to hide it it's been disconnected?

 

normally its for the illumination of the oil gauges, unless somebody has bypassed it due to a fault