@Tim Herald
For better responses to your questions add your vehicle specifics to your "signature", specifically model year/engine. There are many differences between years.
Based on the pictures you posted posted of 91-94 models, the security system used was the TVSS - Toyota Vehicle Security System. All port/dealer installed alarms have the main unit installed under the drivers seat. You need to verify that. When finding a new remote you need to match the FCC on the main unit or existing key fob to a new fob.
You should be able to Google to find a manual.
Personally I would not waste my money on that alarm. Its 30 years old, prone to failure with very poor range.