I'm looking for an alarm/buzzer that will warn when forgetting to switch form VO to diesel. Anything?
Electronics stores like 'Radio Shack' have a variety of alarms and buzzers to choose from, or you could learn about something called 'Google'.
You wouldn't even need a buzzer. A couple of Bosh relays and a hidden kill switch could be wired up so that when on veggie, the key ignition would be bypassed and the engine could only be turned off by the kill switch. When you switch over to diesel, everything works like normal.
This way if you turn off the engine and nothing happens, than you know you're still on veggie.
91 Buick Roadmaster wagon, GM 6.2 diesel conversion (gone but not forgotten
89 GMC 6.2 (Just got rid of the last pieces)
84 Mercedes 300D (gone to the great autobahn in the sky)
94 Cadillac Fleetwood (Sold before I could convert it)