aftermarket gauge questions

[David Hord]

1) Is anyone aware of an aftermarket tachometer (with shift lite) that
works with a 5cyl?  The VDO extreme tach will do this...but it's price is
WAY up there! Anyother options? I'm 6'4" and with my small aftermarket
steering wheel...I can't see the tach or speedometer in key areas!

2) What PSI would be appropriate for a fuel gauge..they are availible in
0-15, 0-30, and 0-100 PSI. I assume the stock system on the 89 90q doesn't
put out 100psi, but I really don't know...any help?

3) In mounting an airfuel mixture gauge, I understand they use a 5 wire O2
sensor...will it be necessary to add a second O2 port to the exhaust
manifold, or does it replace the stock unit...I assume if it replaces the
stock unit then the stock system is able to read off of it?

4) Seeing as I've already got Coolant temp, Oil Temp, Oil Pressure and a
Voltmeter...are there any other gauges that would be particularly helpful
in seeing more of what's going on with my car?

Thanks!

-Dave