V40 TD Glow plug light not coming on
I've got a 1998 V40 TD and the glow plug light is not coming on and it has great difficulty starting when cold, running noisily when started. The tachometer has also stopped working at the same time. I've changed glow plugs apart from no. 1, but I think it's probably a relay or something but I've got no owners manual and the Haynes manual doesn't cover the diesel V40. Hope someone could point me in the right direction.
Thanks
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