Simple tach circuit for Subaru to Vanagon
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Subaru tach output is on the hairy edge of NOT being strong enough to run your VW tach. Give it a try, but if it does not work, you can add this simple circuit. Be sure you verify which method you want to use before you do the final wrap of your wiring harness. Probably better to go straight to the sure thing (add this circuit). Notice that the Subaru ignition uses two coils. Both #1 and #2 spark plugs fire simultaneously, then #3 and #4 fire simultaneously. While #1 is at combustion, there's also a wasted spark at the top of the exhaust stroke for #2. Same thing for #3/#4. This simple solution allows Subaru to delete the distributor. Good riddance!!!
** Newsflash 5/30/00 **For '86 and later vehicles, connect the Subaru oil pressure sender output to the VW blu/blk (low-pressure sender wire) on the round, white connector, and ground the VW yellow wire (high-pressure sender wire) on the same connector. Thanks to a special circuit in your instrument cluster, if you don't do this, your oil pressure light/buzzer may come on when your engine is revved over 2000 RPMs. '85 and earlier Vanagons have only one oil pressure connection and thus no such circuit in the instrument cluster. |
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