Your tach will probably work for awhile and then die again.When mine started to act up,it would go right past the 8000 RPM and drop back to zero or sometimes not work and finally it gave out all together.A new one from Early Birds in Toronto is about $325CDN or they were the last time I checked about a year ago.You can call them at 1-800-463-0546 or check out their site www.early-birds.com .