The Summit thermo switch is probably used to switch on electric radiator fan. And would probably work just fine for your application.
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Where did you buy it and what model and year did you order it for? I might still install one after the redline kit comes in?BMSV is used to block vacuum to the VSV until the engine is warmed up. It screws into the thermostat housing or other available water jacket tap on a 2F. Also, the vacuum to the BMSV and VSV must be from above the butterfly so as to only open the VSV off idle.
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