1073 bulb
The rear turn signals use a standard automotive #1073 bulb, they can be had at any auto parts store and many supermarkets and convienicnce stores, especially those next to the highway.

1157 and 1034 bulbs
The brake/running lights and the front turn signals use a standard automotive #1157 or #1034 bulbs respectively. The only difference between the two is the running light brightness (2 vs 3 candlepower). I was able to tell the difference when I looked carefully, but it proabably doesn't matter. If you have the choice, get the 1034's, they're the brigher of the two, and more light is safer.

They can be had at any auto parts store and many supermarkets and convienicnce stores, especially those near the highway.

#194 bulb
The speedometer light is a standard automotive #194 bulb. It can be had from any auto parts store and many supermarkets and some convienicnce stores, especially if said store is near a highway.

Note that this is the only bulb in the instrument cluster that can be had that easily. The rest can only be had from a Honda dealer.

34908-KM1-671

The Honda part number and description is:
Bulb, wedge base, 12v/3W, 34908-KM1-671

It appears to have a W2x4.6d base, and is either a T1¾ or T2¼. (measured at 6.4mm)

It looks like a #74, or a 17037 (2721), but don't be fooled, it's not. Those bulbs are a little bit too small, and they'll rattle around. They're also a lower wattage, so they won't be as bright, which is a problem if it's the oil pressure light that you don't notice turning on.

A #24 won't work, the bulb is too fat and won't fit into the holder. the base is correct but the bulb itself won't fit.

This could perhaps be a #4590 bulb. #4590 is a 3W bulb, so that's promising. About $1.30 each.

mystery tach bulb
As of this writing, this bulb can't be found at an auto parts store or on the net. You have to get it from a Honda dealer.

The Honda part number and description is:

year	desc.	part number
'88, '89	bulb, wedge base, 12V/1.7W	34908-MG9-951
'90, '91	bulb, wedge base, 12V/1.4W	34908-MN8-700

I can't see a reason why it would matter which one you use, but there's the data.

At last checking, they cost about $2 from places on the net.

It looks like a #74, or a 17037 (2721), but don't be fooled, it's not. those bulbs are a little bit too small, and they'll rattle around. they're also a lower wattage, so they won't be as bright, which is a problem if it's the oil pressure light that you don't notice turning on.

mystery temperature bulb
As of this writing, this bulb can't be found at an auto parts store or on the net. You have to get it from a Honda dealer.

The Honda part number and description is:

year	desc.	part number
'88, '89	bulb, wedge base, 12V/1.7W	34908-MG9-951
'90	bulb, wedge base, 12V/1.4W	34908-MN8-700
'91	Bulb, wedge base, 12v/3W	34908-KM1-671

Headlight bulb
The headlight bulb is a standard H4 bulb, and not a weirdo not-quite-standard H4 bulb the way many Hondas have. An H4 is also called an 9003, or HB2.

The standard stock wattage is a halogen 60/55 watt bulb, but many people have had success with 80 and 100 watt bulbs without melting the high-beam switch or any of the wiring. Be careful, however, as you might not be so lucky, there's some variation in the manufacture of switches and wires.

If you want to run a high wattage bulb, it's a good idea to run a new larger fused wire from the battery to the headlight bucket and use a relay switched off the current headlight wire. It will keep the current from running through the switch and you won't loose as much voltage from the stock wiring which is kind of thin for the high wattage bulbs.

Licence plate bulb

OEM part number 34616-568-671.
Same base as a 1156 (BA15S), but shorter than an 1156.
1195, 1155, 97, maybe others.
8 Watt, 4CP
It's just a plate bulb, it should be “bright enough” but not “too bright”.