Every manufacturer had their own system, if any at all. This was pre 1973 before the mandated US Coast Guard MIC system came into being. So if all you have is a number or code, it will do no good unless you know the manufacturer and if someone has cracked that code.
Boat made by Tide Rider USA, Inc. and she was made in February 1990 as a 1990 model year watercraft.
Here is the US Coast Guard info:
Details for Manufacturer Identification Code TGO
Status: Out of Business
Company: TIDE RIDER USA INC
Company Official: TREVOR HEWISON
Parent Company: SPORTS HOLDING INC
Parent MIC: JTA
Address: 6712 N 54TH STREET
In Business: Thursday, December 08, 1988
Out of Business: Tuesday, December 10, 1991
Date Modified: Wednesday, November 20, 1991
Type: Outboards, Open Motorboats, Jon Boats
Additional Address: SEE JET BREEZE
9TREET ADDRESS 1100 NORTH 50 TH, TAMPA, FL 3361912' SPORT BOAT- WAS MADE BY LASER BOATS IN SALT LAKE CITYCURRENT INFO AS OF 890626; 910304 MSO TAMPA CG-509312/91 OOB PER MSO TAM - TAKEN OVER BYBSC 73 UPDATE 8602 TEMPLE TERR HWY D36 33637-5800. SOS EXPRESS BECAME TIDE RIDER WHICH THEN BECAME JET BREEZE. SEE JTA.