No really cheaper alternative but a wideband is a very wise option when tuning, this is the one am useing http://www.ebay.co.uk/itm/AEM-GAUGE-6-in-1-TYPE-WIDEBAND-UEGO-AFR-CONTROLLER-30-4100-/300976513214?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item46139920be