http://www.racing-planet.co.uk/coun...fc579713d154c6fc9a44d1d35b70ef41#.Ub3YCee1Elk cant be that hard
Bought one of these. Dont need it running all the time its just handy to know the revs sometimes http://www.ebay.co.uk/itm/140922692408?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649