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thank you so much guys! is it a big job to replace the tach? Theres no mechanic out here. Can you point me to any useful resources on how to replace the tach ? Thanks again!

Plane is a 1946 cessna 140. Started it up tonight and everything worked good, when I when to pull the throttle back to allow the oil pressure to climb, the rpm kept climbing to 1500 and stayed there. I pulled the throttle all the way back and the tacometer still showed 1000rpm when it was...