throttle position sensor

Ahoy! Just spent many hours trying to figure out why my port side Mercruiser wouldn't start. Finally figured out that my throttle is a POS. If the port side is not EXACTLY the right place for neutral, engine will not start. I thought we had a bad battery. Does anyone have experience with...

Hoping some of you who have been down this path already could help out a noob TPS wrangler with some advice. I need to change the TPS. I already have the new part with it's little blue o-ring in hand. I looked everywhere and read every thread and watched every video I could find. I cannot locate...