Here in South Florida, Volvos and Janmar ngines are sold by the same a few dealers. When I took my Janmar to the local dealer to have a service Advisor done, they charged me $1000 or so and could not put the engine back together again.
I took it to a second Janmar dealer who did not charge me but spent 10 days working on the engine and could get the oil pressure indicator to work.
Ranger worked with me all the way on my behalf even though it was an older boat that I bought secondhand.
Janmar eventually, with more persuasion from Ranger, told me that if I brought the Engine to Tampa at my expense they would try to fix the problem thei dealer caused when they tryed to install a service advisor.
In the meantime I scanned this bulletin board and found that other people have had the same problem and repaired if I change the wiring harness. Janmar refused to change the wiring harness and refused to sell me one so I can change it At my expense.
I know Ranger switched to Volos and I know that Volvo service is generally superior to Yanmar service. But my problem was with the Yanmar authorized dealer who did the service advisory work. The same set of dealers services Volvo engines as well. Possibly Volvo does a better job of supervising their dealers, I have no way of knowing.
Fortunately I was able to repair the problem but my own. So other than being out the money and about a month of boar about it was the real loss. I did learn more about electronic engines that I had ever hope to know.