Tachometer Issues

bottomlesspit

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11 Nov 2011
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Hi, New to me problem, but almost certainly not a number of you so hopefully you can advise. Volvo KD 31 Engines (Diesel)

Port Engine Tacho --- Ignition on, needle flies across to max, stays there until engine start than back to zero - stays there!

Starboard Engine Tachon - Ignition on, Needle stays zero, Engine on, may eventually move but takes a while.


Any thoughts on problem/solution

TIA
 
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