So recently I set up a tach on my jetta and I thought I would share how I did it.
First off, I know there are several other ways to do this and it might be worth checking them out as well. Also, I am posting this in the MK1 forum only because I did it on a mk1. It works on all 1.6d and tds.
Now. Here is the part list for this.
-Bike speedometer sensor(5 bucks online or $20 at wallyworld)
-A pack of super magnets(5 bucks from a hardware store)
-1 led and 1 1k ohm resistor(5 bucks at radio shake or 75 cents online)
-A stick of jb weld putty(5 bucks from hardware store)
-A metal braket about 2''x1/2'' with a 6mm hole in one end(the lower anti rattle clip from a set of injector lines is perfect)
-Standard 4 wire tachometer with a 4 cylander[2pulse/rev](20 bucks online and up)
-Misc wire and conectors
Ok, now for tools needed
-rag and cleaner
And here we go.
-remove the upper timing belt cover if installed(will need to be left off) and clean the camshaft pulley at 12,3,6, and 9 o'clock on the engine side.
-Take your putty and glue 4 magnets onto the camshaft pulley at 12,3,6,and 9.
-Take your metal braket and bend it into an L shape with the 6mm hole on the short end.
-Cut the sensor wire off of your bike speedometer close to the head unit. There should be two wires. We will get to them in a bit.
-Trim any zip ties on the sensor off and jb it to the braket.
-take the 10mm nut off of the front passenger side of your valve cover. mount your sensor and braket with that nut and shaft. It should be close to the magnets on the pulley.
-follow the instructions to wire in your tach minus the wire that would go to the coil. That will be conected to the circiut made by the sensor.
-Connect one of the lead from your sensor to the fuel celiniod wire on your injector pump. Connect your other one to the resistor and coil wire to the tach.
-Connect the resistor to the + lead on the LED. connect the - lead to a ground.
-Cover the led and resistor in jb to prevent shorts
-Allow the jb weld to set for 60 minutes(perfect time to install the tach in the dash if you haven't yet.)
-Make sure you tach is set to 4 cylander.
-Fire her up and enjoy your new tach!