there's a lot of management to choose from...
piggy back or stand alone.
obd1 and obd2 are types of wiring..
for your car, if year of manufactured is somewhere around 1990 to 1994, i believe that it should be obd1.
if you're looking for a management for your engine and on a tight budget, i would suggest that you try to put in a custom/tuned chip to your ecu.
if you can spend about rm1k for a management system, i would suggest e-manage.
if you're looking for about 10 whp gains for your engine, then you should think about a stand alone ecu. stand alone ecu should be in the range of rm2k+ for a 2nd hand apexi power FC; rm4k for a brand new microtech and around rm12k for a brand new haltech. however, i don't think that you need a haltech if you don't plan to make your car into a track car.
a tuned chip or an e-manage should be fine. i managed to gain about 15 whp with an e-manage to my suprise. however, do note that there's a lot of factors to be taken into consideration. when i gained the 15 whp, my engine was stock with just and air filter and a freer flowing exhaust system. i could never gain an additional 15 whp again after that. unless if i'm thinking about cams and a new management system.