The core speedo will run with no fan perfectly on 1s you will only need a fan if you run it on 2s and there are some settings you can play with like punch and brake and there are timing settings but if your running blinky it don't matter plus if you do decide to upgrade you should be able to sell it easy enough
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Schumacher kf
Schumacher sv2
Durango Dex210
Carisma gtb x2
Schumacher gt12 x2 
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