I installed an aftermarket tachometer in my 2.0L SPI Focus. It seems to respond perfectly to engine performance without lagging at all. The problem is that the tach rarely reads over 2,000 RPM, and I know my engine is doing more than that at times. I can put my foot to the floor and it barely goes past the 2.
Gday mate it seems like we've got the same problem i think in regards to the taco set up you need to wire it directly to the ecu the problem is trying to find what wire it is you could try ford and see if they will give you a wiring diagram if not try a auto elec maybe they would be able to help let me know how you go
I have ask some other ppl about adding a tach to the SPI and they say u have to wire it to the ECU. Take the signal wire and strip it back a little. Then push it up into the ecu wire harness at the 47 pin position. Tape the wire so it cant fall back out.
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