Guys,
We just completed a built L18 / 5 speed conversion into my brother's 79 1200 ute, and we have a couple of problems I was hoping those in the know could help us with.

1: The coupe looped tacho is wired up as per wiki info, (please see pic) and all we get is some very slight jumping around every now & then when the engine is running. - The tacho wire was the wrong way around (to "-" trigger) & I changed that when I checked it as per the pic. - Any ideas?

2: We are using the early skyline stumpy 5 speed, what model dato do we pilfer a speedo cable from to get the factory 1200 speedo working correctly?

Happy with the build, we are running the engine in but can tell it's a huge improvement over the worked A14 that it had previously. - Much more torque. The L18 was rebuilt with Hypatec pistons, 10.5:1 comp, Anothony Koch spec'd cam & a good port & polish. It's running a jetted down draught weber we had laying around until it's ran in, which will be swapped out for a single 45mm side draught.

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  Tacho wiring.jpg (26.55 KB)


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Looking good mate. Speedo wont be working right even if you get a cable i used a 180b one but i think just a 1200 auto one will fit pretty sure i tried it on my stumpy box with coupe dash. You would need to get it calibrated to be accurate.

Anyone got any ideas re: the Tacho?

have you tried another tacho incase the one your using is rooted?

Haven't got another one... :( - My guess is that I very well may be.

Measuring up the L20b for another ute now... :) 0 Wonder if we can get that in without modding the crossmember too...

In your diagram you have the signal feed to the tacho to the + side of the coil. It should be connected to the - side of the coil.

To work, tachos need:
1) "-" side of coil for rpm pulse/feed;
2) earth;
3) "+" power feed usually via ign switch (although I have a Stewart Warner after market tacho which doesn't require a power feed. It just has earth and "-" side of coil)

The wire to the + side of the coil is simply the coils power feed from the + side of the battery/ignition. By wiring as per the diagram you essentially just have both sides of the coil connected to the + side of the battery.

the coupe taco picks up pulse from positive coil supply
like pic,not negitive like after market tacos
u have it hooked up right just swap the wires going thrugh
taco loop over[power running wrong way through loop it will flicker]
thats y the black with white trace wire has a male and female connectors
so it cant be connected wrong
tommo

200b speedo cable might work out but probably need a recalibration for the speedo.

looking good, doubt you will get l20 in with out sump mods and xmember mods, from looking at pigdogs

what radiator did you end up using and fan? single or twin thermo fan on front of radiator(10 or 12 inch/???)