There are a number of control units in the 92 Civic. If you mean the PGM-FI, ECU (engine control unit), it is behind the passenger side kick panel.
Testimonial: "if this also control the speedometer big tnx for your tip"
You might check some fuses involved:
In the engine compartment fuse box:
Fuse 31 (15A) PGM-FI Main relay fuse
Fuse 32 (7.5A) PGM-FI ECU, Clock
In the under dash fuse box:
Fuse 18 (7.5A) PGM-FI ECU Main Relay
if you are looking for the ECU and where its installed, try the right side of the car behind the front kickpanel and glove box
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