Ammeter: remove your dash cluster after disconnecting the battery. Put a D-cell across the ammeter contacts, and see if it moves. If not, it is fried.
Temp gauge: Use Ford temp sending units. The reading can be controlled by adjusting the constant voltage regulator on the back of the dash cluster, but it will also affect the gas and oil pressure readings. That's strange that on a cold start it will read 70% within 1 minute. My best guess is that you have an aftermarket TSU, and it's not reading well.
http://clubs.hemmings.com/baymustang/platesmall.jpgLet me check your shorts! My multimeter is just a-waiting! Formerly known as Midlife in the old VMF.
King of the Old Farts *struts*
Temp gauge: Use Ford temp sending units. The reading can be controlled by adjusting the constant voltage regulator on the back of the dash cluster, but it will also affect the gas and oil pressure readings. That's strange that on a cold start it will read 70% within 1 minute. My best guess is that you have an aftermarket TSU, and it's not reading well.
http://clubs.hemmings.com/baymustang/platesmall.jpgLet me check your shorts! My multimeter is just a-waiting! Formerly known as Midlife in the old VMF.
King of the Old Farts *struts*