Tach backlight operational; now, instrumental lights aren’t

[Pearly72]

I’m stumped! Before I try to dissect it and mess things up more, I’m going to ask you guys - who have never led me astray before.

I hooked up a new Sunpro tach yesterday, which was given to me by the PO when I bought my truck. Red was jumped to an accessory fuse (a/c fuse: I don’t have a/c). Green, of course went to HEI, Black went to ground... and the WHITE (for tach backlight) was jumped to the Instrumental fuse at the top right corner (drawn on a generic photo attached).

After wiring it (first tach install I’ve done), all worked great. RPMs consistent and backlight worked. However, it was daytime and I didn’t check my instrumental lights. Drove it all day and all worked well... still does. However, when parking into the garage at dusk, I realized that my instrumental lights were not on!!! After adjusting the dimmer, still nothing.

White (tach light) wire install: stripped the wire about 3/8” and wedged it between the top of the fuse and the connector. The fuse did not look popped, but all I had was my phone flashlight. Should I have not hooked it up to the fuse this way and hooked it into the “feed” slot? I’m confused, because I figured the fuse would still have a complete circuit.

Has anyone experienced this? I knew I should’ve found some instructions! I will pull the fuse and make sure it didn’t blow when I have better light.

Before I screw things up even more, may I have some guidance? Thank you in advance!!