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Installation Procedure for Programmable Distributors

Installation Procedure
1) Before removing the old distributor from the car, check which direction the rotor is moving. (CW) or counterclockwise (CCW) seen from the top. (put that on a little note, together with the proper ignition sequence).
2) Now bring the engine to the TDC, at the end of the compression-stroke, for cylinder number 1.
(the rotor on the old distributor should point to the cable that connects to the sparkplug of cylinder number 1)
3) Now put your 123\TUNE in the car (Note: wherever the 123 rotor is pointing now is your new #1) and find a position where the cables and the vacuum-nipple come out conveniently. 
4) Connect the wires (Red, Blue etc) according to the proper diagram, but do not connect the black wire yet. 
5) Turn on the ignition. If your rotor rotates CW: rotate the unit CCW until the green LED just lights up. (also press the rotor in a CCW direction, to remove any free play in the drive) If your rotor rotates CCW: rotate the unit CW until the green LED just lights up. (also press the rotor in a CW direction, to remove any free play in the drive) (The LED shines through one of the holes in the aluminum disc below the rotor) For all models: if you expect a bad ground connection: use the M5-threaded hole in the bottom-face of the housing, for a direct wire to ground. Turn off the ignition. 
6) Now, connect the black wire to the coil according to the schematic. Connect the spark plug leads in the proper sequence to the cap, starting with the wire for the number one cylinder at the position pointed to by the rotor of the ‘123’. Also connect the high voltage wire from the coil to the center position of the cap. Attach the cap to the distributor.
7) Route all wires well away from the high voltage leads and away from moving parts, using tie-wraps or other suitable means. Connect the vacuum-tube (if there is one) from the carburetor to the nipple on the ‘123’. Older engines may have a screw-connection for the vacuum-advance diaphragm. In this case you can use a short length of rubber hose to connect to the 123, or remove the hard line to the carburetor and replace it completely with thick- walled rubber vacuum-hose. If you programmed the proper advance-curve, you can now start your engine!
8) Always! Always! synchronize the app on your phone with the motor using a timing light.
To do this warm up the motor. Pick one of your low timing ponts in the curve you loaded into the phone app. For example 12*@1000 rpm. Now use your timing light to confirm what the crankshaft reads, to the app. If it is not the same, loosen the distributor and turn it slowly until it does. Then lock it down. From now on all timing can be changed on the app. Make sense?