swiftyrs

Wer 2 start ...
s1 rst....got an issue with the loom ....having tested and changed numerous parts under the bonnet ..ecu fuel inj mod ..dizzy ..coil.. mfi unit electro mag switch etc etc..car runs lean wen accelerating hard ...apparently loom has a continuity / resistance problem...
question is..
where's the place to get correct replacement wire from in the correct colours...
new plug connectors from
what's a reasonably priced continuity/resistance tester
.........
is the problem on the mfi electro switch ..causing a false signal back to ecu..??
any advice greatly received...