We had tacho installation problem with out 98 lancer with no tacho on the panel. we got a aftermarket one but when we had to wiring it up it needed a tacho signle from the ignition coil. The ignition coil is built into the distributor which made it hard. The 2002 is the same distributor setup as the 98 so you can get step by step instructions with diagrams and pictures from my page, you will see an link that says Mitsubishi Tacho installation. website is
www.sureyya.biz let me know if you find it useful.
Goodluck
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