[VWNate1]

You want an inductive typ, this means the wire clamps around the plug wire and then you have two clips to connect to the battery .

New @ O'Reilly's it's just under $40 , used ones are far cheaper, I've been using a SEARS Craftsman one in Commercial Service for over 50 years now .

$5 at an Automotive Swap Meet, look up how to use it on you tube then don't pay a dime until you've tested it .

Most sellers have no idea how to use this useful tool anymore and so will take pretty much whatever you offer .

The ones with a dial on the back are the best and easiest to use, once you learn how to use it you can make $ and impress your buddies by fine tuning their older engines....

In general you want the engine to be warmed up and idling as slowly as possible (under 700 RPM) and set the timing to 8 ~ 10 degrees BTDC .

There should me NO VACUUM SIGNAL to the distributor until you open the throttle .