i have a civic hacth with a d15. at what MPH should i shift? im a noob at 5sp. someone tell me!

 

not mph, but rpm. it depends on the driving you're doing. 1st and 2nd about 4k.

 

For fuel economy or for optimal "performance?"

 

both.

and also i dont have rpm gauage thats why i asked for MPH. the previous owner did a 5sp swap.

 

According to my 1990 Civic CRX owner's manual, this is it:

Maximum allowable speed in the DX with out overrevving:

1st gear: 35 mph
2nd gear: 60 mph
3rd gear: 90 mph

For good economy:
shift to 2nd at 15 mph
shift to 3rd at 27 mph
shift to 4th at 39 mph
shift to 5th at 53 mph

Yeah they don't show engine speed, I don't know why...