I'm pretty sure this is the relay I have. I think you can find it cheaper.
https://www.ebay.com/itm/Intellitec-....c100677.m4598
You apply coil power one way and it latches on, then apply coil power the other way (swap the 12 volts and ground) and it latches off. So you could control it with a DPDT momentary switch (center off). I made an electronic controller so I could use a simple SPST push button and kill the engine first.
I've never had a problem with vibration. It's a "solenoid" type so no springs like in a relay that hold the contracts.