If it were my choice I'd take the tank heater back and get a freeze plug heater for that make and model. Costs about $50 and comes with a metric adapter that fits it right into the block. In my opinion a freeze plug heater is far more efficient than a tank heater and much easier to fit to the engine. The adapter for that type of heater should be on the passenger side of the block just beneath and toward the back of exhaust manifold. I just installed the heater for a 300 into my 190 2.2 and it was about $50 at napa. To fit it to the 190 took a bit extra due to the shallow water jacket but was still pretty easy to fit.
Regards,
Jim
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