hey mate, i had that problem twice, once was because i had one of the pins in the wrong plug on the tacho, mine is for 4 - 8 cyl, is yours the same? it may be something simple like that, the other time it happened because of the alternator, we disconnected one of the lights in the cluster and the alternators "exciter" wasnt working and it kept dying, the tacho went first always and everything else will soon follow if it is this, hope you can find out what is wrong with it mate
regards, kalani.
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tradesafe: Dazda, 2ndTimeStanza, Qeleh, big mac, hatchman
1979 Datsun Sunny Wagon 13b Turbo conversion:
http://ozdat.com/forum/viewtopic.php?f=60&t=28890