Hi community;<p>I have sorted out 99% of the little problems my car was giving me; most of them were due to oxidated electrical contacts. I replaced the connectors and now everything works perfectly except for the tach; it won't tell me what RPM's my engine is doing. The white/red cable was connected correctly when I looked and it is still... is the instrument itself kaputt? How should the signal coming from the wire be measured and what should it look like?<p>The other problem I have are vibrations. I changed the rubber coupling (the one near the gearbox) in the prop shaft/drive axle or how it is called and things got much better but still it isn't perfect.<p>Can the middle support bearing be a cause? I must add there is a whine sometimes, a whine that changes frewuency with the car's speed. The joints seem to be alright; there is no play if I turn the one tube one way and the other one the other way and backwards. Are there other possibilities?<p>Thank you in advance for your help!