i want to put a fe gauge in my del sol. its an obd1 so i cant use anything that plugs into your computer. i would be happy with one of those inaccurate vacuum driven ones, but i cant find anything! or does anyone know where i can find the best range for me to keep my vacuum to receive the best fe? that way i can just get a simple vacuum gauge.
The easy answer is, keep vacuum as high as possible- which is easy, just accelerate as lightly as possible.
However, pulse and glide is more efficient and will get better mpg. On your vacuum gauge the pulse will have low vacuum and the glide will have high vacuum.
A vacuum gauge could be very useful to get an optimum "pulse" each time.
Someone else on here that has a vacuum gauge may be able to tell you the optimum inches of vacuum for the most efficient pulse, but it sounds like it is somewhere around pushing the pedal halfway down- its a little different for each vehicle though.