When these cars were produced they really only had strobe light RPM tach setups, hand held. They wrap a probe around a spark plug wire (#1 plug wire!) and it fires the strobe.
Basic models have it set to fire instantly, but higher end models can off set the degrees to make it look like -10 is actually 0 TDC, but forget this is you have a standard model with no dial.
Would have to see a link to your other models to know what you are attempting to use on hand.
I just picked up a car with no tach (92 base model), and it is missing the little capacitor device at the top corner of the intake manifold. It could have been integrated into a spot near the ignition coil and likely is there, but I am going by memory and have not owned a 4g15 powered model since the 20 aughts.
Manuals are located here for quick reference: www.lilevo.com/Mirage/