You will require in addition a main wiring harness and also a controller that's compatible, something like the Eberspacher Easystart Pro with timer functionality would be ideal. I believe your Mikuni will have used 24mm id exhasut pipe, but please check this out also. Old exhaust pipe can easily damage when installing new heaters so we do recommend to replace as this is safety critical - exhaust fumes etc. We also supply this heater within a basic installation kit which may prove more cost-effective as a purchase. Perhaps give our Technical support team a call (+44) (0) 1522 243310 to run things through, or email our tech guys - sales@butlertechnik.com
Thank you