I swear this is true
Before I got into HVAC service, I sold auto parts for about 16 years. This is long before Al Gore invented the internet, before we knew how to use HEI modules. This was early to mid eighties.
Some guy came in and wanted to talk to me. He said he had a Johnson/ Evinrude V4 with electronic ignition, like a 50-75 hp, the marina wanted 500 bucks for a new ECU. I had sympathy. He wanted to adapt something automotive. I had no real answers, suggested he try and put the older breaker ignition they used to use in it. He hemmed and hawed, and wasted time, and wanted answers I could not provide. We were busy, the phones were ringing, customers were waiting, and I was getting irritated.
I finally told him "Ya know, you could fiddle around and get something rigged up, but if it quit you on a cold day, you could spend a REAL long cold night on, say, Lake Pend Oreille."
"Oh," he says, "this is not on a boat. IT'S IN A HOMEBUILT HELICOPTER!!!"