Thanks! See below:
1. Give speedway harness part number.
910-64022. 22-circuit harness.
https://www.speedwaymotors.com/22-Circuit-Universal-Automotive-Aftermarket-Wiring-Harness-Kit,229874.html
2. Advise how many electrical gauges? Which ones?
Right now I have just the tach hooked to the single harness wire. The other one I'd like to hook up on the same wire is an aftermarket volt meter.
3. Do you now have same wire for gauges and for tach? Is that what you said? or it's just going to tach, nowhere else?
Yes, same wire for gauges and tach.
4. You added a volt meter somewhere?
Yes, it was in one of those 3 packs with temp and oil pressure.
5. Using original gauge cluster? If not, explain
No, not using the orig gauges at this time. Beyond the Speedo, I have no idea what the condition of the other gauges is (yet).