Under the dash board I think.
my opinion-if it is designed for 87 use 89.
88 + 8/8 = 88 +1 = 89
89 = 88 + (8 / 8)
With a bit of a cheat: 88 + 8/8 = 89
You can use either octane range of 87 to 89. But Daimler-Chrysler recommends to use 89 octane for optimum performance.
The electronic control module is located behind the right side of the dash board
88 + 8/888 + 8/8 = 89
The diagnostic port on a 1989 Honda Civic is found in the front of the engine bay. The wire harness will have and extra clip in front of the passenger side of the firewall. This is where a computer can be plugged in to check for codes.
61 = 89
It is so easy and so much faster when you use your own calculator: 89*97 = 8633
Struts.