Advice needed on gauges!!

Also just got a dual gauge piller with one lunar A/F ratio gauge. What should be my last gauge. I wanted a fuel pressure gauge but no luck finding one under 200 dollars.
I was looking online and saw this: http://cgi.ebay.com/ebaymotors/UNIVE...62035411QQrdZ1
Would this be of any use for me?? Most all the gauges are something I already have in the stock speedo so no reason to have 2 of one
Wish I could have a boost guage but i dn't have a turbo.
ANy suggestions on what I should get to complete my set?
Thanks!






