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This is from AutoMeter's site concerning hooking a tach's signal wire to the Ford EDIS (Electronic Distributorless Ignition System) which you should have in your 99 scort.. if I'm thinking correctly.

Ford 2.3L, 3.0L, 3.8L, and 4.0L (through mid 90's, 95 & older usually) distributorless ignition

The green wire from the tach will usually connect to pin 12 on the DIS module, and it is usually a black wire with a yellow stripe. This is usually the IDM (ignition diagnostic monitor) or the EDM (engine diagnostic monitor). (2.3L is = 2 PPR; 3.0L, 3.8L, and 4.0L is = 3 PPR)

Sleeperscort has a How-To on his site that will probably help you some. I think most of the information on that page is still very relevant to your escort.
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