Ahhh, actually I think sixto was serious about the cigarette butt, foam peanut, etc. That's a pretty well known fix for that tach problem. Try your cleanup first but if that doesn't work, and I'm guessing it won't, follow sixto's advice (except about the rack damper pin, that WAS a joke.)

__________________
LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold