Replacing Renault 1.2 TCE auxiliary drive belt

[General Zod]

I hope someone might be able to help me here. Got a 2007 Twingo GT TCE and there is a mild squeal when starting up- i think it must be the aux / alternator belt. So I bought the replacement kit from Renault (link below)- it comes with what I think is a tensioner pulley. Is this job relatively straightforward? I found a guide online which says you need a "Tension gauge - No.Mot.1715 or Mot.1505". Is this really necessary? Anyone done this job on this engine (D4Ft)?


http://renaultpartsdirect.co.uk/products/Renault-T...

Thanks!